Go to
http://www.tirerack.com
The ASA AR1 wheels are on the first page, once you pick the car, then goe to wheels.
I have the 18" x 8" with the 35 MM offset on the front, and the 18" x 9" with the 45 MM offset on the rear.
I bought a new set of Continental ContiSport 245/45/18 a while back. They are a little too tall for the Q, but fit the car fine. I used to have 8" wide wheels all the way around, so I could rotate. When Evie spacked the storm sewer and ruined one wheel, I decided to get 9" wide rims for the rear. I bought a 275/35/18 rear tire, which matches the OEM size and load rating, but look a little small on the rear of the car (short sidewall). I will up-size to 275/40/18 the next time I buy tires.
Your best bet, is to get Tire Rack to mount and balance the tires for you. I was going to go with the BFG's if I didn't have the Continentals already. The BFG's are cheaper, and I haven't tried them yet.
Don't go with any uni-directional tread patterns, because they are all noisy (maybe not at first, but give them a few thousand miles). The BFG's are unidirectional, but look like they would not feather as bad as the others.
Be sure to get tuner lugs, because the standard lugs barely fit in the wheels, and most tire shops will scratch the wheels installing them. I keep a 1/2" ratchet, extension, and deep well socket in the trunk for flat repairs. The OEM lug wrench will not work on these wheels. Most tuner lug nuts come with a key, that is hardened steel, and will fit in the smaller lug openings of these wheels.