5x114 (its actually 114.3) is the bolt for our car.
Tires run in 3 dimensions, width, height and wheel...
Width is the width of the wheel, height is the profile of the tire, and wheel is the wheel size..
225/45/18 is what would work on a 18x8 wheel.
DTD's ebay store..
http://myworld.ebay.com/discounttiredirect/
do a search there for that tire size... looks like the cheapest ones they have are around 500ish... then minus the 11% live.com discount, and they balance em free if you buy em both from em...
You are looking at btwn 1100-1200 for the set mounted n balanced... I got my 20s for that price with tires... but its all up to you and what you want.
Personally id hold my breath and wait on live.com to increase the discount.. I got the tires that would run you $550 for $375 for the set of 4! (that was when live.com was 35% discount)
It fluctuates, but then again the spring is here and it may not be worth waiting for!