I would wait till the Titan comes out, maybe Chevy will offer better deals

seriously if you can it only favors you
I read somewhere on TS.com that a guy bought a similar truck with a sticker of 35k and after everything drove away with the truck for 27k

just reading other peoples buying experience with chevy I would not except anything less than 8-12k off their vehicles.
MSRP verse invoice on a domestic vehicle is twice if not 3 times that of an import, my 4Runner had an MSRP of 42,755 and and invoice price was 3k less, an Explorer or TrailBlazer with MSRP of 40k had invoices of 30k, thats a 10k difference and major profit you don't need to be paying.
I take it you live at home and is this your 1st new vehicle that your buying from a dealer cause I know I have been seeing Zero% financing but you need excellent credit plus 3k cash back on top of that, the insurance through your parents makes it less but in your own name for slightly more actually builds your credit up more so if you ever want to buy or rent something they see that
I would also go to Ford and Dodge and get trucks with prices similar to the Chevy you want even test drive a Ford or DOdge to the Chevy dealer and compare them, dealers get nervous when their gonna loose a sale, and they will start lowering the price, play their game, act like you don't really need it cause the more you look like you can wait forever to buy it the more they take off to sell it.
Every dollar you save can be spent on the mega aftermarket Chevy has, just think of what 5k could do to a chevy
Think I said enough and enjoy the new truck