interesting question, i hadn't really considered the vixen mounts to date. from a quick search on the interwebs, it looks like many people see a periodic error with the vixen of around 15, which is about half what I have with my NEQ6. With PEC I have my NEQ6 down to about 6 arcsecs. Now if a similar sort of improvement is possible with the vixen mount then that would be superb.
Assuming that the cost is not a barrier, I think the limiting factor would be how easily you can do the GOTO conversion with ASCOM compatibility. If you're certain that is straight forward then i reckon it would be a goer. If you dont have ASCOM then it would have to be a no go i think. EQMOD compatibility would be nice as i certainly find the EQMOD/Alignmaster/PECPrep/Stellarium a pleasure to use (and all free).
Then again, if you can tune your existing NEQ6 and use PEC to further improve performance, why rock the boat...?
