To the OP:
CC seats 5, but the back seating is not SUV or sedan like. It is actually pretty bad for adults (even more so overweight people). It is okay for short trips, but I wouldn't agonize people for too long there. It works great for kids and child seats though. Rolling up the seats and putting in groceries is always nice too, but getting a bed cover and putting them in a net is better.
If I could buy all over again, I would get the longer bed and 2 door. Having a short bed really defeats the purpose of a truck. Yea yea... I got a trailer, but it is pretty damn inconvenient to use a trailer and they are really pretty dam expensive. Towing on a mid-size truck is worse than I initially though... though this truck is designed for it, it really tows MUCH worse than a full size dodge ram with the cummin diesel. It really fails if you compare the two. The dodge ram gets 18 MPG while towing a 5000 pound boat too...
Though the MPG of a CC and KC is supposed to be the same, it is not. A CC gets about 1 MPG less and feels heavier on the road. A CC with 4x4 is about 2-3 MPG less than a KC 2wd. Another words, the KC 2wd will be getting near 20 MPG on the highway, but the CC 4x4 will be getting 17 MPG highway during the summer and 14-15 MPG during the winter.
Don't think you will spend only 6-8k for a new truck... after everything adds up and assuming you get at least the SE trim, you're talking AT LEAST 10k more even if you buy at invoice price...plus you're not going to get blue book value for your trade even if they say you will (even more so considering you got a big dent). They are just giving you incentive to buy a new truck and to get them to sit down in their office to deal. You'll get 2k+ lower than blue book value... though they'll start with offering 6k explaining all that is wrong with your truck.
Lastly, you go the Nismo trim. The 2010 equivalent will be hard to bargain for and you'll end up paying a lot more than you'd think. Generally there is only about 1 on a dealer lot and they can delivery more from another dealer lot, but that makes them even more expensive. Getting one straight from the factory is even more expensive.
IMO, you got a good truck and should keep it longer.