Re: M1A vs 308 AR
I don't think you're getting anything with the EBR over the AR, even the cool factor. Cooler than an OBR, GAP-10, LMT MWS, SR-25, or Noveske? In my humble opinion, no. I love the M1A and regret selling the one I had but for practical use the AR beats the EBR hands down. If I ever replace my M1A I want it to look as close to the standard issue service rifle as possible because I'll be getting it for my gun collection, not for my serious use rifles.
In my experience the .308 ARs I have used are more accurate, more ergonomic, easier to put optics on, and easier to work on than the M1A. The latest wave of M14s pressed into service for OIF and OEF as DMRs wasn't because it was the best rifle for the job, it was because there was a need for them and we already had them in the inventory.