This will solve all your woes ;)
http://www.co-ar15.com/forums/showthread.php?t=40366
If you are tight on cash I'll work with you as much as I can.
i have all, and the choice is...
I have em all, ran em all in our local club 3 gun events to test em out. My choice was the fal, with the L1A1 mag release. My G3 clone gave me a black eye because of the stock hump and improper mount. The M1a suffered from reload time. While the fal and the M1a have the same type of reload from how you insert the mag, the G3 is more like the ar.
Overall, look at dtechsuperstore and get an ar15 in a different caliber. 6x45 is a great caliber, 25-223 has some promise also. When compared to the battle rifles, weigh makes a huge difference. Give me an ar10 over the 3 above mentioned guns anytime! You just can't compete with the reload time, weight, and the accuracy. Find a gas piston ar10, and you're DONE!!!
The fn SCAR has proprietary mags, watch out for that one from a cost perspective...