Cale-Awesome, I love those tires. Can't wait for the pics. Congrats on the new one as well.
knights- Listen to Darkie, hes done a great job of laying it out for you. From reading your posts-its seems like you aren't going to be happy unless you fit the maximum size you can with only "reasonable" rubbing. Personally I would look at the 275/65/18 and 285/65/18s. Also, if you can deal with a skinnier size and less selection, check out the 265/60/18s. Its still 32.6 tall while retaining the smaller profile and lighter weight (better mpg). Again, as already mentioned, you will have to decide how much performance you are willing to give up and if you want to have a matching spare.
Since you have mentioned the 275/70/18 a few times, it seems you may be leaning that way. That size is rare on this site (and all other 4th gen forums) due to the reasons already mentioned. However, there are a few members that come to mind. See
KrazyNative's post here as hes running that exact tire also.
T4RVA was also running that size in GY SA but decided to downsize to 275/65/18s due to rubbing. You may want to contact them for any specific questions regarding that size as very few have actually ran it. However, there are others who run the same diameter and larger so just search around.