335BK

So I currently own a audi S4 with some mods. It's fast enough but to me lacks some character. I've always wanted to try C63 (sedan) but could not justified the price. I see couple of new C63s on autotrader in my area (NJ) which got me thinking if now is the time jump in and get sizable discount. MSRPs are around 74~75K. How much discount should I ask for the soon to be replaced model? Other car I'm looking at is the new M3 but I plan to avoid the first year model. Ideally, I would like a 507 but can't find one near me and if not 507 then I'm looking for a big discount. Thanks for the inputs.