I've got both a Century Arms CETME and a kit built FrankenFAL I picked up at a local gun shop. I love shooting them both, and don't think I'd get rid of either.
If you're thinking CETME or G3, you'd probably be better off building, as finding a decent CIA CETME is getting pretty slim, and most G3's and clones of HK quality are in excess of 1k.
As far as the FAL, I love mine, but it is a heavy bastard, but sure is fun to shoot. I've got $225 in it, and I don't think I'd take double or triple that for it. FAL kits used to be like the old AMD AK kits. They use to be cheap and plentiful, and alot of people are still kicking themselves for not buying them up when they had the chance. Now that the kits are back on the market, they are roughly $200-300 higher than what they were before. However, if you're pretty well inclined at building, which from some of your posts I've seen before, I'd say you are, go with an FAL build. You can probably find someone to rent or loan the tools. And, I'm sure everyone around here would be very helpful in giving you some pointers.