can anyone that has built the Karken as to how many channels would be needed? I just checked the hobby shop here and I could get a 4 channel or a DX5 or DX6. The only thing I have a problem with the 4 channel is that it will not come with mixing or rec. both the DX5 and the DX6 are out of my budget at this time. so my question is this without the receiver or mixing can the 4 channel be still used?