I really like GT5 - always liked the series until the point I'm at now, where money and points are harder to obtain and the cars you need to complete events seem a lifetime away!!!!
Really like NFS - just turned my wireless on and your name popped up all over so had a go at a few online events, great fun - I'm a little older than I think I am sometimes, it's such a fast flowing game my brain to controller ain't what it used to be lol
As for the wheel, GT is fantastic with it, in fact can't imagine playing without it.
Yet to try it on NFS, hope it does work and is a good combo. Down to about £79 last time I saw one, maybe less now - I'd recommend one