i plan on getting one also.
but when depends on a couple factors. as mentioned, I will not pay some rediculous dealer mark up. if the dealers try and do that, they will kill the car for GM and GM should threaten dealers that if they hear reports of it then they wont get ANY! see how they like that! dealer mark ups are what killed the modern Ford Thunderbird and GT. I know I would give my local dealer a lecture if they pulled that stunt.
Which model depends on price, packaging, and performance. It will definitely be a V-8. I wonder what the difference will be btw the top line and detuned V8s? If all it is is a tune and something stupid like a more restrictive exhaust (that I will replace anyways), I will definitely get the cheaper one.
I may wait a year also just so I can have my truck paid off and save up a bit more for the down payment.