Probably Slytherin, but if not, then maybe Gryffindor? I have a lot of traits belonging to the other houses (but none more so than Ravenclaw!), so it's hard to choose.
But, I don't really see myself as a Hufflepuff--I'm loyal and hard-working to an extent, but they're not my strongest qualities. I can be bold at times, so there's some Gryffindor, but not a lot. So I guess Slytherin, since I tend to think before I act and am pretty ambitious, although I lack the manipulative qualities that the house is so famous for.
In the end though, Ravenclaw is definitely where I fit best.