i jsut got some of the omni mixers from www.veetail.com they are great gadjets. true 14 bit accuracy. i installed them and flew them in my 4 rotor thingamabob and they work great. however, all they sell are the omnis and for the correct setup (control of aileron elevator throttle and rudder) it will require 3 mixers and it will cost $168 with shipping. they are great. however, don't attempt to do it without the rudder. here's why. personally, i can't get the motors so absolutely perfectly strait up that the thing will not yaw a bit. it will turn on you. within 5 seconds it will probably start. you will have to land everh time that happens. one more thing. you say you need to mix speed controllers. make sure your speed controllers are very perportional. those cheaper 16 step controllers simply will not do. the hitec 1010 speed controls were great, but they discontinued them. you want a speed controller with individual bec switches, and you at least want a motor arming switch for each motor. you may be able to find the hitec 1010 controls somewhere, they were great. only $20. the gp electrifly ones cost abotu that, but they have neither an arming switch nor a bec switch.