So I just picked up my 07 G35x last week (prem + nav) and I'm really happy with it. I decided to lease it, and here's what the deal was:
negotiated $36,600, which is about $1000 over invoice. (MSRP $38,900 i believe)
$5000 down, which included taxes, title, reg, etc. the cap cost reduction from this worked out to be $2311.
39 months, 12k miles
$408/month
money factor 1.9 (.000792)

I know, I know. I shouldn't have put any money down. Mistake on my part, now I know better. Aside from that, seems like a pretty decent deal?