Just to clarify - buying an existing house in Adelaide will run you usually at LEAST $280k-350k, and that's just a 2 bedroom with backyard. Building is always a lot cheaper.
My specs are as follows: 2 storey house. Bottom floor - a study room (medium sized), a spare bedroom (med-lge), a WIDE hallway with WIDE doors everywhere (I'm sick of trying to shift furniture through standard doorways and having a struggle) and built-in bookcases in the hallway on one wall, reaching up to the ceiling with one of those roller-ladders attached to them so I can reach the top. I should be able to fit 3 large bookcases in there. Then there's the lounging area - not exactly a lounge ROOM. It's a section big enough for a U-shape of couches and a coffee table, but no actual walls apart from the study wall on one side. On the other side (ie. behind) there's a kitchen modelled on my current one, but with the opening in a different place because of the couches. Oh, and a kitchen table in between the kitchen and the lounging area, which will hopefully just fit with enough room to push your chair back after a big meal. On the other side of the house from kitchen is a long rectangle of a room for my music room. It must be big enough to hold a drumkit, an organ, a bunch of guitars and a few little bits and bobs, a mini-fridge full of energy drinks and a small table for a laptop so I can do some recording. This music room will have soundproofing in the walls surrounding it, and a glass door (again, WIDE) that is soundproof too. That way I can play music at any hour. The soundproofing in the walls is one of the things that makes me think this house doesn't exist yet, along with the fact that the music room has to be BIG.
And the bottom floor has to have a medium sized bathroom with no bathtub (I never use them, and they're basically just dust traps) but maybe a desk with mirror and chair so anyone so inclined can do their makeup in style. And those diva lights surrounding the mirror! And a smallish laundry (doesn't have to be big, really) next to the bathroom, and a set of stairs leading to the second floor.
Outside the house: outside the laundry door is where I'll have a small shed, a clothes line, and leading in one direction to the carport, and the other direction to an external room that is physically attached to the corner of my music room, with a shared corner so I can get easy electricity into this external room. The external room will block the path on the outside, but there will be doors on two sides to make it easier to get through if need be. In this room there will be a pool table, dart board, and mini-fridge full of beer, and a small cabinet for pool-stuff. Out the other door, and you immediately see the sliding door that leads into the kitchen/hallway/next to the music room's entrance. A big built-in BBQ against the fence opposite the sliding door. A path that leads round the corner of the house, but another external room in the back corner of the property. This room will hold the spa and all accessories.
Round the corner, past the spa room, and we have a bit of garden - no grass, as I don't want pets, but flowers and stuff. Leads right up to the fence door that would lead back on to the driveway, or thereabouts.
Upstairs!
The stairs are roughly in the middle of the house, on the left. As you crest the top of the stairs, you see directly in front of you a medium-sized bar area, with big fridge like the one in the kitchen, only this time with a wine shelf inside for my whites. Behind the bar stools is the lounge room. 2 recliners, a 3-seater, a big TV on a cabinet. On the side wall, a big stereo with my CDs, and then my DVD racks nearby. This is leading towards the front of the house.
The lounge room / bar area has another openly-joined section - a gaming table and display cases for my Warhammer stuff, and then more towards the front left corner of upstairs, a smaller TV with as many game systems hooked up as possible, a DDR mat (if I can find one now that they're all but extinct) and an exercise bike. Here is where I exercise, body and mind.
There's a door in the middle of the front wall. This leads to the extra-special room over the top of the garage where I'll do my artistic things.
Other end of the house upstairs - directly above the music room is a bedroom of the exact same dimensions, only there's a small addition to this bedroom. Let me explain - there's a hallway leading to the bedroom door, and the bathroom is directly opposite, sharing a wall with the bar. At the end of this short hallway is a storage area with shelves and plenty of floor space - it's nice and out of the way, the only reason to walk to that part is if you're using the storage area. Now, the bedroom goes a few feet past the storage area, as does the bathroom. In the bedroom there's a special closet BEHIND the hallway storage area for hanging up clothes, storing shoes, whatever.
And that's the building layout of my house. There are already some red flags as to why this building probably doesn't exist yet. BUT there's more.
I don't like the "normal" colour schemes of houses. I mean, the outside can look however it wants, but inside I want free reign. And here's my current fantasy:
Black painted walls and ceilings. Dark red carpets. Dark blue tiles. Furniture that suits the colours around it.
And that colour scheme is why I assume nobody has ever built this house before.
/ramble
Many belated happies, Cliff. 
Sounds like heaps of fun. And fred, good luck with the clothes shopping!
The big hug kind
) The Zibibbo is a sparkling white, MissMacc. Very yummy, and a laugh to pronounce.