09 manual Z34 touring + sport, low miles

[Vaughanabe13]

OK, I'm pretty serious about this one, what do you think it's worth - keep in mind this is a dealer purchase and not private sale. Basically it has all the options I want and even my favorite color but the price is going to be the make-or-break factor of this deal.

09 6MT
4600 miles
One owner, clean carfax, clean title
Sport package
Coupe Touring package. Chicane Yellow with black leather interior
No navigation
Condition looks very good to excellent, with a small rip in the leather on drivers seat on the side where you enter.
Certified pre-owned.
Comes with dealer nationwide lifetime powertrain/engine warranty (not sure if that is even worth anything or just a "dealer incentive" to raise the price)
KBB private sale value is $35,675. NADA clean retail price is $34,200, NADA average trade-in is $28,850.

The dealer was originally offering 32.9 which is obviously high. I got him down to 31.3 over the phone and he gave me the "absolute lowest price, not a dollar lower" schtick at that point, but I think I can get him lower.

What do you guys think I should offer and/or be happy with? I was thinking of offering 29 or 30 but that's a pretty big discount and I'm not sure he'll go for that. Thoughts?