I'm selling my first car and will have some money to spend on a semi-auto rifle. I want a quality rifle $2500 or less, in 5.56 or .308. I tend to lean toward the manufactures who have been around awhile or milspec because I don't sell guns once I've bought them. Any input would be great? 1. Colt LE6940 (5.56) 2. Springfield M1A (.308) 3. Armalite AR-10 (.308) 4. Something else?