Phew...I thought I was the only one!!
I had to replace my drivers side rear wheel after hitting a curb at speed. Felt like I was driving on a washing machine the wheel was so far out of round. I took it to the shop and they found an out of shape wheel but not a bent control arm. I got a 17" wheel off ebay - I got it from a wheelshop in Detroit (will see if I can get the name) - was perfect on delivery (looked brand new) and have had no problems since.
I hope you get this one resolved soon - clearly you need a better start to your boxster days!! Good luck! ANd welcome to the club!!