Submit or Query?

So, here's the question, should I query an agent with my book or submit to one of the on-line publishers like EC? It's a 63K erotic-romance, heavier on the erotica than romance. If it sells, it will be my first book. So, from those of you that know, is my best bet to query an agent or try my luck with Ellora's Cave, Red Sage or one of the others?

Asking because I want to know.

At the moment, I'm learning. My career, the one that pays the bills so far, has taught me that singles are better than home runs, or at least more realistic. I am hoping to find a place I can build on. I've written a book I'm happy with. It's interesting, good even, anyone that's comfortable with a lot of sex will find a reason to keep reading and won't be unhappy when then get to the end. I wouldn't claim I've written the next great novel, but I hope someone would read it and consider reading my next book.

So, what I want is a place to start building my name. If that's e-publishing, I'd love to start there. If finding an agent and a publisher is the way to go, that's my ticket. But like I said, for all intents and purposes, I'm a straight up rookie. Any and all advice is welcome.

Thank you for the direction. I plan to complete my final draft of the work for submission this fall. It has been seasoning since June. I suppose I need to brush up on my query writing skills.