Although I haven't driven a 2009 M35...
06 M45 Pros:
I like the raw power of the V8, without having to mess with bolt ons.
I like the fact that the navigation is DVD based, rather than hard drive based, in case you pick up a newer-to-you nav disc without having to go to the stealership for updates
I like the orange interior lighting - but it's starting to get a little dated. Some folks hate it.
M45 Cons:
Some have had oil consumption issues, I've been lucky though - no probs for me
09 M35 Pros:
I like the exterior styling of the 2008/09 better, esp the front
I'd rather have a 7-speed transmission, than 5-speed, especially if you do a lot of highway driving
Hard drive Music Box -don't have to mess with CDs, MP3 players, your smartphone, etc.
NO orange interior lighting
More performance aftermarket parts for the VQ35DE engine than the VK - although that means, spending more $$$
Prolly cheaper Elite Infiniti warranty for newer car with fewer miles
Seems like the 09 M35 would be the better way to go...I'd have a hard time trading my M45 in, but would probably do it
