Great information, I appreciate the feedback. I've got to sell my other toy, my Jeep, and I'll be re-barreling once that happens. The .243 option, whether AI or not is really tempting, but I did some more research into shooting the lighter bullets with the 1:8 twist and everything I read agrees with you Brian that it should work just fine.
So, my plan is to get the 1:8 in 260 Rem and just see what shoots well. I should be able to find something in 123 grain that shoots well... but if not, I'll shoot something a little heavier.
The Jeep has been a lot of fun, but time to come back to my first hobby.. shooting.