Welcome to Nico
G37 ha.
I have one question tho. Why 37? You can get the 08 sedan for much less than you'd pay for the 09.
Coupe or sedan. It is up to you. Me the sedan just makes more sense. You can utilze it more. The sedan is as fast as the coupe more room inside and more trunk space.
Coupe is sexy tho.
About the 09 g37 issues. Nothing really I can think of. Here is one tho.
http://forums.g35club.org/zerothread/399633
I'd go for an 08 sedan if I were you. The price you'll have to pay for just hard to beat.
And I am biased. LOL
zozo