Lumpy196, I'm in the same dilemma that you are. I'm interested in those exact 2 rifles for the exact same reasons. I'm also considering the AR-10.
I've only shot 1 FAL. I put about 8 rds through it and it malfunctioned 4 times. He said it was being tempermental. It jammed so badly that he had to smack the op handle against the side of the shooting bench to unseize it. I'm sure this was a rare occurance, and that these guns are very good, but it left doubts in my mind. I've shot my full-size M1a alot, with only 1 malfunction.
I don't consider the mag price to be a determining factor, it's a one time outlay of cash. It may hurt at first, but then it's done. It's not like one shoots .20/round, while the other shoots 2.00/rd. That's an ongoing cost that will always hurt. For me reliability, ergonomics, reliability, accuracy, and reliability are what I care most about.
I was going to post a similar thread, but you've already done it. Thanks. I'm looking forward to other people's suggestions.
P.S.- I'm not badmouthing, FAL's, only relating my one experience.