You will get so many recommendations that you might go crazy.
There are many good ones and the good thing is you do not need to spend a lot of money to get some very good performance.
Think first what is going to be it's primary use. If for that purpose you need a special type of round and this might narrow the posibilities. Think about the rifle as if it was USPS and the bullet your package. First decide on what do you wan to do with those bullets and then decide about the best delivery method for that type of 'package'.
- The M1A is hard to beat but you pay for them. I have the SOCOMII and the Scout and they are superb. The SOCOM is heavy and bulky but it runs like a charm like all M1As.
- The FNAR is finicky with the loads. Mine is the 20" light barrel and only likes low grain and high grain bullets. Average loads do not do so well. It is also hard to take down and maintain but when you get the right load they are very accurate. It is based on the Browning BAR rilfes but "tacticalized". MAgs are expensive around $80 each.
- AR-10, DPMS, RRA are good systems. The light barrel ones are manageable but if you want more accuracy the start to get really heavy. Stay away from the 24" and 26" barrels. It is totally unnecessary.
- SAiga .308 in 16" barrel they are affordable and extremely accurate for the money.. I posted this link about one conversion I did...
http://www.thehighroad.org/showthread.php?t=567005
I am getting same and better accuracy with this one than the M1A which is crazy for an AK type of rifle.
- All the surplus FAL, Cetme, G3s are ok for some people but they are heavy, not that accurate, and they are OLD designs. Maybe more for a collection type of interest although some people have retrofit them sometimes quite well to their needs.
Think first what you need it for and what you really want, then this might help you. Be honest to yourself. Sometimes I do 'compulsive buying' and then I end up not using some of the rifles that much. For me accuracy and reliability is the first thing I look for. For me more important than looks but other folks have other preferences like looks(wood), size, weight, etc...
Cheers,
E.