Looking at Weld's website, the largest wheels i see is 18x9.5.....Unless you want to be limited to a 285/295 rear tire, that's not ideal. 18x10 would be the minimum i'd run on the rear.
The S71's are so expensive now....$1200/wheel. Weld is running a 15% off until Friday so that helps a bit. I was lucky enough to pick up a brand new set at a steep discount through a connection but it was still a $2500 order. Better than $5k I suppose.