I've had a few ARs - unfortunately NY state has made a mess out of AR-15 ownership. So while my interest has not waned - my *want* to deal with the state's stupid laws has kept me from going further.
Ran both a 5.56 and a 6.8SPC II - once I get out of here I'll likely be building a 6.5 CM too.
My lowers on both were from a local dealer here who had their own machined / anodized / etc. I love supporting local business and these guys are pretty solid (the 5.56 is running one of their bolts too)
6.8 - AKA my deer gun (or it was)
5.56 - ignore the stock - I had plans to change it - but wanted functional at the time. I've also pulled the A2 rail and it's got a strikefire on it.