Almost forgot to add... Shooting Times recently reviewed a 6.5 Grendel chambered AR mod... Very nice weapon. Pricy as hell... I remember 10 years ago thinking $700 was an awful lot for a new AR, but now you're lucky to get just the lower for $1000. A good AR variant will, just like the barret in that link, cost over $2000. Damn gun control freaks... They simply shouldn't cost that much, and the gun control efforts are just making them more popular.
I think I'd like one of the improved calibre AR variants. The 6.5mm grendel isn't terribly impressive except for the fact that it's about the most performance you can get from the AR-15 platform, and you can get pretty good accuracy and a 30 rd magazine in a reasonably durable and easily maintained rifle. It makes this a nearly perfect "sport" hunting rifle, except for in a few locations that mandate limited-capacity magazines in hunting rifles.
Silly me, I spent $350 for a mini-14 when it would have been a much better investment to buy a high quality pre-ban AR for $800. The mini is still worth about $350 and shoots like crap, but the AR would be a tack-driver out to 300 yds and would be worth $1,500 by now.