Another option is the Thule 9001/2 - it is a VERY good rack and I've used it on extended trips of 400Km (250mi) without an issue. It is also very kind to bikes, with ample rubber padding, etc.

http://www.thule.com.au/details.php?...id=&submenuid=

I'm sure they'll be cheaper for you over in the States, compared to what we pay here.

cheers