Re: Which varmint upper and twist?
I know this is an old post but here is my .02 anyway. The answer to your question is a 1 in 12 twist. As far as who makes an affordable upper, they all do. Now, assuming you ment a QUALITY affordable upper, that knocks some folks off the ladder.
Rock River Arms, White Oak, Stag, and DPMS all make uppers that will hold better than MOA with a quality ammo.
.308 Howa 1500, 24" varmint barrel, Harris bipod Bell & Carlson MkII tactical stock. 4-14x50 tactical scope from Wonder Optics.