It's been said before on this thread, but it's always worth repeating. Rather than use the net as the first place to search for a publisher (where you're likely to come across scammers advertising for victims), check your book shelves and nearby bookshops first. For example, I seem to own mostly HarperCollins Voyager, Orbit, Tor and Orion/Gollancz books in my (UK) SF/F collection, so I would want to look them up first. At this point, with a list in hand, it might be worth researching the names you've gathered on the net or in a book.