Here is my write up of the RM router that I have:
http://cnczone.com/forums/showthread.php?t=40870
Buy three stepper drives and power supply from these guys:
http://www.kelinginc.net/KLDriver.html
Buy a breakout board here:
http://www.cnc4pc.com/Store/osc/prod...products_id=49
If you have a VFD for the spindle buy a controller board here to control the spindle with Mach3 cnc:
http://www.cnc4pc.com/Store/osc/prod...products_id=58
And a 2Ghz computer (with out on board video) and you are set.
I don't remember what is the faster rapid speed my setup will do but it is around ~175IPM I will never be cutting anything even close to that speed. A few days a go I was cutting some aluminum plate and with a .05" depth of cut the thing was screaming.