My AR's are the ones that I like and shoot the most. You can find an AR in the price range you quoted if you look around. You can build one for that amount also. The best thing you can do is try to fire each one and decide which one you like the most. Asking on a forum which is the best won't get you anywhere. Everyone has different preferences...
USAF Retired, CATM, SC CWP, NH NR CWP, NRA Benefactor
To preserve liberty, it is essential that the whole body of people always possess arms, and be taught alike, especially when young, how to use them... -- Richard Henry Lee, 1787