A cheaper alternative to the Motec is the Autronics. A few mates had them in their evo III's with good results, both the motec and autronic are probably overkill when there are guys getting the numbers and reliability with wolf 3d/haltechs ect...
I personally had a Wolf 3d V4 with handcontroller for the VR4 and many other guys ran them without a hitch. The only issue now is that Wolf have moved onto the V500 and aren't really supporting the V4 anymore.