Yea, I love Jettas!! In fact, there are actually waaaaaaaaaaaaaaay to many choices!! Oh well, I guess half the fun is looking and anticipating - kinda like a new guitar!
With 2x12s and 4x12s + multi heads + bass guitars and cases you really need a van...but, out of the choices you suggested, I was very impressed with the room inside a Honda Fit(with the different seat configurations and flip flops). This of course would necessitate careful measurements before purchasing. Good luck and enjoy the shopping.