It depends on what you want. If you would like a good platform that you might want to upgrade in the future I would recommend a Lonex M4 or JG M4. I own a Lonex and it has had minor upgrades installed (barrel, bucking, mosfet) and am currently running it at a comfy 24rps on an 11.1 lipo. If you would just like a reliable gun that won't fail you, but won't take to upgrading quite as well, then I would recommend a KWA. This might be an unpopular choice, but KWA has great customer service and are known to last for ages as long as you take care of them(As with any gun). They are NOT the greatest AEG to ever exist, but they will do a good job at what they do. Hope this helps

Oh one last thing: I can not recommend getting a MOSFET and Deans wiring enough. They are GREAT and don't cost much.