There are different options for both stocks as far as adjustability, but I think that would put you over your budget. I was mainly looking at what is on Midwayusa for choices in that price range. You may be able to find a great used stock here or on other forums for around $300 with some adjustability. I am not sure as far as the weight differences.

I have read great things about both the Mcrees and the AICS platforms. I chose the Mcrees because of cost, the ability to swap grips, and the Mcrees looks more user friendly for my shooting style.