Look to Colt, DD, BCM, Spike's, PSA, S&W for good reputable brands at a reasonable price.
Good advice here. These brands all put out good rifles that are very comparible in quality in my experience. The S&W rifles are a little less "mil-spec" than the others, but are still a nice package.
The Sig M400s are starting to make a good name for themselves lately as well.