I would personally get it. I've owned 5 different AR10's/DPMS's/Custom GA Precision rifles, and I feel that the .260 Rem and AR10 action were built for each other.
When I saw the new Armalite AR10 in .260 Rem at 2012 SHOT, it looked pretty sweet, and had a Douglas select match 22" stainless barrel.
I had GA Precision build my last .260 Rem AR using a Bartlein, and I have zero issues loading the 130gr VLD, 140gr AMAX, 140gr VLD, 139gr Scenar, 142gr SMK, and 140gr Match Burner. All those pills will load fine in my rifle at 2.800" SAAMI, with plenty of bearing surface/shank ahead of the neck, and the gun shoots.
H4350 and RL17 are great powders for the .260 Rem with the 130-140gr VLD-type bullets, and I get 2850fps from my 22" barrel with the 130gr VLD's, and 2700fps with RL17 with the 140 and 142gr, with sub-MOA groups easy. Best groups have been .4" for 5-shots.