I have a '06 Graphite Grey MR and was considering to purchase either one of the above-mentioned rim. Which do you think will look better? I'm going to get 18" so what's the widest I can go without rubbing? What offset to get the extreme concave look? Thanks for your help and advice!

 

TE37 Time Attacks aren't going to give you the look you're going for because the widest wheel they offer is a 18 x 9.5 +34 and the spokes aren't very concave. They still look good IMO though. You'd need to run a lower offset on that wheel to achieve that look so the regular TE37's would give you more of a choice versus the T/A's.

 

I think the time attacks would look great but like the dude above stated 18X9.5 is the widest you can go.I saw pics of the exact same car as yours with some CE28 TA's with the same specs and it looked really nice!