First thing VPI need to do ,is get rid of the motors they use and especially the silly RUBBER DRIVE BELTS.
Stiltskin,isn't the Raven One using a rubber belt as well? Can you run the Raven with strings or tape?
The issues of belts is a controversial one. Both the Raven AC I heard as well as my DPS use rubber belts. The DPS has a different drive system with a friction bearing, that puts a constant load on the rubber belt and removes some of the belt problems.
Otherwise, I agree with the above - I haven't heard a VPI that can touch either one (owned a Scout, heard Scoutmaster, Aries 3, HRX).