I've got an 95XP800 and I've found absolutely no problems with reliability or parts, the only extra maintenance is the bearing carrier. And that's not a bad price, if the ski is in good condition, spring is around the corner. I don't think I would bother with the 94XP unless you are just looking for an extra ski.
If you just buy the 95 does the trailer come with it? If not then it would be worth buying the 94 also.
Lou