Hey what's up. I was giving suggestions earlier over text. I'm working on finding you some links, someone has already said G&P M120 which was going to be what I recommend. I have done a ton of motor research because I am going to run my M14 at 500fps so I had to, and G&P motors came up a lot. (If your curious, I ended up getting a Guarder Infinite Torque motor, but I am running a totally different set up, and would not recommend the same motor for your set up)
here's one guy who has help me a lot, and he talks about the G&P from personal expirience:
http://www.airsoftretreat.com/forums/in ... #msg774077 look for namloot's post, about halfway down.
ya i just looked, that's the only one that I can find right now. I think it is cheaper than the matrix one you were looking at.
And don't get systema magnum's. Read some threads on ASR about those. They perform AMAZINGLY,
while they perform But countless people have had them destroy gearbox after gearbox, stripping pistons and gears. So if you are going for reliability, and don't want to spend $100 on a motor, don't get the new Systema's. The old ones are supposed to be very reliable though