I test drove several of the models discussed, didn't drive the Caliber but sat in one. In no particular order..
1. Mazda 3 5 door - nice small car, but feels small too. Still considering.
2. Subaru Impreza - too small for me to be comfortable.
3. HHR - quite nice to drive. small windows look cool, but I prefer the view of the world through bigger windows. Still would consider buying one. Better drive train than PT Cruiser, better mileage. More expensive so far.
4. PT Cruiser - I owned one for a while, a GT, was very nice except for gas mileage. I'm considering a non-turbo one, because I think they are well made and designed, and sell for very low price sometimes under $14.
5. Caliber - just a quick impression, but I thought the interior felt very roomy, almost like a full sized car. Haven't driven one though. I like the exterior styling. Would consider buying one if a good deal was available.
6. Pontiac Vibe/Toyota Matrix - haven't test driven one yet, but I like the looks and good epa gas rating. Probably get a better deal on the Vibe, I figure.
7. Toyota RAV4 - way more expensive than I expected so I gave up on them without driving one.
8. Honda Civic - just sat in one, a little too small to be comfortable.