tbh im still running stock wheels, i dont know a lot about which manufactures of wheels are good and which ones are bad, but to answer your first question, you can use any wheel that has the 5X114mm bolt pattern, and just for the record, some sites list the pattern as 5X114.3mm which either will work, i think they are exactly the same, just some site round the numbers off and others dont.
i think these would look pretty sick though
http://www.2kracing.com/Product/2112606.html
but keep in mind, bigger wheel means you need new tires, so you should just shop around on wheelsnext or tirerack.