I have a logitech g25 wheel, 2 logitech g25 shifters (1 modified for stiffer shifting, the other stock), logitech pedals with seperate leo bodnar usb controller (for improved dpi) and I even bought a little rubber cube and put it in the brake pedal plunger housing (forgot where I got it, $10 or so) to increase the break pedal stiffness from midpoint through the end. I also have a logitech driving force pro. I also have the fanatec gt3 wheel and clubsport pedals. I run the usb directly from the pedals to my pc, so the dpi is the same as with the leo bodnar controller.
I like the fanatec wheel and clubsport pedals a little better. The pedals just seem to be more professional in design and they have endless adustability. Fanatec also recently came out with an adjustment kit with 3 different springs for each pedal (varying in stiffness) and an even more adjustable pedal plate for the gas pedal. The brake pedal is adjustable on the fly with a simple turn of a knob. The brake pedal also has vibration functionality that only works with 1 game (never used it). The fanatec wheel is better because it offers in game adjustability (steering angle, sensitivity, etc) however the force feedback is slightly worse on the fanatec (in terms of intensity IMO) but the belt drive is so much better than the gear drive it makes up for it. Fanatec wheel also has a dispay that works with a few games (never use it, other than in game adjustments). I have never had any problems with either wheel or pedals (guess i'm lucky). I do like the paddle shifters on the logitech wheel better and as far as mounting, if its not bolted in - forget it with the fanatec wheel, their temporary mounting solution totally sucks. Logitech's is much better. I have 2 racing cockpits and both wheels are bolted though. I have 2 120" screens, one cockpit for each. 1 1080p projector, 1 1080i projector. Race perpendicular to each other on pcs and ps3s. I also have 2 jtaged 360s, but only one xbox wheel (I'm not blowing a poop load of dough on 2 more setups for the xbox).
Other thoughts: The fanatec wheel and pedals where much more of a pain in the butt to setup with windows 7 because the drivers were'nt available at the time, they are now though. fanatec tech support sucks, you kinda have to be your own tech support. Logitech tech support rocks and is wayyyy better than fanatec's.
Ok here's the deal, bought the logitech on ebay - stock, added the brake pedal mods and bought another shifter on ebay to modify, probably about $240 into it. bought the fanatec wheel on fanatec's website for $299, saved like $70, no shifter though. I'll tell you a little secret also, they charge tax for california, like 9 point whatever frickin percent, so I simply put my zip in and put colorado, he he, no tax. they charged my card and it arrived a week later- don't tell anybody though (they also might have fixed that already, I bought both wheels about 8 months ago.
If I had to do it all over again, I would have bought 2 of the fanatec setups, I'm sorry the pedals are just too pimp and they're worth $200, they even sell adaptors for inverting them and it was only another hundo for the wheel, which is marginally better than the logitech. I don't use a shifter with the gt3, I do with the logitech tho.