Hey Tony... I sent you a couple messages a few months back... Never heard from you... Man, I really would like to get a Tromix upper to play with, that 458 SOCOM is a serious HAMMER!
As for the top quality players, Bushmaster leads my list... No question, quality, price, and features make it a great buy. The Bushmaster barrels are very durable, and accurate for general purposes... If you plan to make several small holes become one large one, then you may want to look at Krieger, Douglass or maybe Wilson, but for 98% of the people, the Bushie Barrel will get it done.
Rock River has raised the bar, and if they offered chrome lined barrels as standard fare, they'd probably steal much of Bushmasters thunder. Both companies have excellent customer service, and following.
DPMS has a nice product, but I'd still go with Bushie, or RR.
One the other end, Armalite is back, and building some of the best complete rifles out there, with a slight premium in price, as usual. Colt has continued to remain a top player, but they still have some challenges delivering a 'Mil-Standard' product that uses regular parts... It'd be like buying a 1911 that used S&W pins, or something non standard and special... It'd be the only one that did it.
If you're shopping, look no further than RR or Bushmaster, IMHO.