I am going to purchase some 20" rims within the next month and I was wondering if anybody knows any good sites to buy from. Any good brands I should look out for/ any I should steer away from?

I generally go to tirerack.com for that kinda stuff - but I don't know anything about rims for this car, so I can't recommend one in specific. I'd watch out for lightweight though (it'll list the weight on the site).

I think OE Creations has factory rims in non factory sizes / give them a try

Do you happen to know the bolt pattern and lug nut size?