im looking into purchasing a 2003 g35 sedan. how durable are these cars? what problems do they have also? i found one at a local dealership for $20,000 w/ 53k miles. is that worth it?

They're durable; they're worth it; no major problems--just some minor annoyances like any car; that one is overpriced--I paid $18,500 a year ago for a 2004 sedan with 43K miles.

how are the g35's when they have close to 100k miles?

I don't know. I'll let you know when I get there... I would suspect not much worse than any other car approaching 100K miles...

I got my '03 70k miles sedan with navi for $15k.

My service engine light turned on a few weeks ago but everything is running great. I just need to get that light checked out. Also, I had one incident of the A/C controls going haywire and it turns out that's a common problem in the '03s.

I recommend going for a 04 or newer if you can afford it.