I know you have pretty much made up your mind on the Colorado vs. Fullsize thing, but I'll add my $.02:

I drive a company truck that is a Colorado reg. cab. It is a 2.9L 4cyl/auto so of course it is pretty gutless. With that aside, the interior feels pretty chintzy to me. I just can not get comfortable in that truck no matter how I adjust the seat. I know everyone is different, but thats my biggest problem with it. I will also have to agree about the build quality. It just seems a little cheap to me. Granted this is a base model truck I am talking about, but there isn't a whole lot of difference except maybe the seat fabric and the radio.

Iv'e had a much better experience with my old Ford Rangers and would probably not ever buy a Colorado/Canyon for myself. No offense to anyone out there, but that is just my opinion.

Im kind of in the same boat as you, I cant decide whether I want a RC or SC or 2 or 4 wheel drive.

Good luck,
Joey