275/30/19 will fit the stock rim. I recommend the new SUmitomo HRTZ-III from tire rack.

The Sumitomos were around $700 for the whole set. I was gonna go with Bridgestone REO1-R but they are backorered 8weeks. The sumitomo's have been getting great reviews and beat out several more expensive tires in Tire Rack testing. So for the price and the 300 treadwear I gave them a shot. So far I realy like them. They ride smooth and now that I have put some miles on them they are hooking up great. No more spinning or TC taking over. SO much better than the stock Contis.

here is my setup:
Stock springs/pads in front
18x8 TSW Snetterton
235/40/18 Sumitomo HTRZ III

Eibachs in rear with #1 pads(thinnest ones)
19x9.5 TSW Snetterton
275/30/19 Sumitomo HTRZIII

Car is dirty and the sun was setting but here are some pics