you can have these on your doorstep in 2-3 days:
http://www.tirerack.com/tires/tires....e&autoModClar=
We got 32k out of our GY LS2s. Not the best tire but they held up ok. I recently plugged a hole in one of them too. I think these new Potenza's sound like a pretty good alternative. My BMW dealer said they'd mount them for $20 a corner.
Also, for what it's worth, tire rack has the LS2s in stock (at least for the 35i sizes) and could also be at your door in a couple days:
http://www.tirerack.com/tires/tires....i&autoModClar=