May I suggest you hit your LBS (local bike shop) and go test out some bikes. That's always a terrible thing for me to do ... I have several shops around me - most carry some of the same brands - but then each may specialize in other certain bike types. Tis a fun thing to do (and dangerous - especially if you GET THE BUG) - but it may help you settle on what you want.

And then you think of the next bike you want .... have fun and explore!

Plus I'm not sure what kind of riding you were aiming at either, supposing road riding - touring? commuting? etc.