If you're going gas, GHK AKM. Since day 1, I haven't had a single complaint. It's rock solid. A bit costly though but hey, worth every penny.
Edit: Rereading your original post, it seems like you're probably interested in an AEG.. Soo I'd say Real Sword would be one of the nicer options, maybe VFC.
Last edited by 13enz; February 27th, 2013 at 02:14..
Reason: Added info