The only complete AR rifle I'd pick up right now is a PSA, cause they're cheap and spec'd well. A built lower with a Colt, Bravo Company, or Daniel Defense complete upper would be a fine weapon.
An M1 from the CMP would be a pretty safe bet for under $700 (I think).
An M1A is also very effective, and can be found used for around $1300-1500.
When you're ready to shoot some suitable rifles, let me know....I've got a few of them. MBRs rule!!
