I think both are priced a bit high. Most items in the GMC are Standard. I would think for that money, you could find an extended cab. An extended cab is a wonderful item if not to keep certain items safe and dry. The mileage is good, but keep shopping and don't be in any hurry. Also, I would suggest finding a mechanic to give ANY vehicle a quick look before purchasing.

The '07 Chevy truck is definitely over priced for what you get. You might find the same truck with miles in the range of 7-9k if you keep looking.

You need to remember that in buying vehicles right now, it's a buyers market. If you find one you like, offer them a lowball price, make them come off more than they intend to. I tell them I'm going to buy a truck and I don't care who sells it to me as long as it has what I want, and the price is right.

The GMC sellar may do the deal knocking it down another $1,500. You won't know unless you try.

I bought my 1/2 ton ext Chevy brand new in '09, everything you mention above plus Factory Leather, pwr windows, locks, seats, mirrors, split heat/air, got them to toss in bed liner too. It's a low end LS series and sticker price was $32,550. By the time I was finished dealing, I left with the truck and NO trade in for $25,526. It took me 6 dealers, to get one that just wanted to make a sale regardless of his profit.