When you guys buy these wheels, how do you set them up when you play?  I'm not really into racing games but could see myself enjoying them if I had a decent wheel, but just not sure how you'd get it all set up.

Sorry if its a dumb question!

You might want to wait for closer to the release date because they may release a special edition wheel or something, this is just a guess. 

If your budget is $100 I suggest ebaying a used one. I got a Driving Force GT for about $90 on ebay, and this is when they were $150.

 you can get a G27 at amazon for around $180 after a $60 rebate.

http://www.amazon.com/gp/offer-listing/B001NT9TK4/ref=dp_olp_new_map?ie=UTF8&qid=1277228039&sr=8-1&condition=new

 That's with free shipping also.

Another option around $160 in the fanatec Carrera wheel which is suppose to be out around GT release but if you got the cash now get the g27 wheel before July 3 at amazon. It's a very good wheel for only 80 more than for a  DFGT wheel.

Yes I want to know this too. Do you have to fixate the wheel (and the gear box) on a table with screws or something?

Logitech wheels have screw clamps which will work up to a 2 inch thick table. this includes the gear shift. One problem with the g27 wheel is you can't get tighten the clamp screws tight enough to keep the wheel from moving. I fix this by going to Walmart and buying kitchen cabinet liner. Put this liner under both the wheel  and gear shift stops any movement. another option is to hard mount them on to the table.

 In most cases Logitech wheels are plug and play when it comes to PS3 and PS2 games. One problem though with G27 (came out before GT5P)  is the game doesn't recongnise the paddles in GT5P. (from what I've read you could use paddles with the older G25 wheel) I have no doubt this will be corrected in GT5.

 I personally use the paddles more than the gear shift. I've got an Obutto racing cockpit with a Buttkicker.

 One of the advantage DFGT wheel has over the G27 is all the button are on the steering wheel while most of the  G27 buttons are on the gear shift. G27 has more quiet ans smoother wheel and 10 time better pedals. The most disappointing thing with DFGT as with any  other $100 wheels are the cheap pedals.

I dont want to hard mount, but I don't know what "kitchen cabinet liner" is and we don't have Walmart in Sweden.

You can buy it at amazon as well.

http://www.amazon.com/Duck-1100733-Non-Adhesive-12-Inch-20-Square-Feet/dp/B002AS9NB2/ref=sr_1_5?ie=UTF8&s=home-garden&qid=1277415551&sr=8-5

What is it, plastic or rubber?

it's feel like cheap rubber. It works better than my Obutto rubber mat glued to the pedal plate. After wrapped this liner over the plate my pedals don't move an inch.