Pulling the trigger on the GT/CS at that price?

Ok, so I'm finally jumping in and about to close the deal on that '07 GT/CS. I've gone back and forth between dealers and beaten down the price as much as I could and here's what I got: $30,663 out-the-door, including tax, tags, all fees, everything. The only non-mandatory options that I got was the active anti-theft system and the 3.55 axle back ratio (it's a manual).

Basically, they're charging me Invoice + $400 before tax.

I feel like I'm trying to squeeze water out of a rock at this point. To all recent owners based on your own price tag do you think it sounds great, fair or I should keep hammering it??

THANKS !