Thanks for you business in the past! It's certainly appreciated.
As I'm sure you know, the 19x8.5 AMR's are in stock at the moment. We're expecting a shipment for the 20x10 Charcoal AMR's the first week of July. I hope that's not too long of a wait for you! I wish I could get them here sooner..
Let me know if there's anything else I can help with!
Both will work perfectly fine with your setup. If I had to choose, I would run a 19x10 in the rear and a 305/35/19 MT drag radial. Then again, I'm much more concerned with drag racing, you may be interested in auto cross or just cruising!