Hey, just came across this deal from AnandTech (i love that place!). ANyways, OZ wheels, especially the Tubolares are on sale for only $70 each for 17"!!! HOwever, they don't list that they will fit the 944. I know someone else on this forum used to have OZ rims, and I know that OZ is pretty well respected for their design and durability.
http://www.ozwheels.com/hm.html
click on the part where it talks about their sale!
(and NO, i am in no way associated with OZ)