I just bought a new UTG-L96 for 160, came w/ scope, stand, extra mags, etc. Came highly recommended, I hope it works out for me, if so will let you know.
As for Spring V/ AEG, falls under a what you perfer line of thinking.
Spring:
Quieter
More Power out of box (the L96 comes 450 fps oob)
Tends to be more Accurate
EASILY UPGRADABLE!!!!! (Thats a big one for me, new to the game)
More Realistic
AEG:
Faster ROF
Larger Mag sizes
No tiresome bolt to pull back the spring if your firing a lot
My best reccomendation is to try and find someone who already has the guns, or a place you can rent one, and try em out. Get a feel for which one you like better, since, lets face it, your lible to spend an hour or two not moving for that one perfect kill.
-Jobie
NADS Sniper