On the second link of your original reply, the website notes that 8.5" wide is all that our vehicle can fit. That being said, it does not mention if a staggered set-up can allow 8.5+" in the rear. Either way, I do want to keep my set-up even for two reasons: 1. It's a DD, so I want to be able to rotate my tires. 2. I'll be installing the Pedders Street II as my second upgrade will come January-April (parts availability) and doing a staggered set-up will give me understeer and negate the wonders of Pedders.
Therefore, as stated, I think I'll be looking into 18x8.5. Thank you for the websites! I'm sure there are more out there, but I was able to learn a good deal from them and the choices are better than I previously thought for our car.