I am 6'4", 250lbs and just bought a used MX 78 ski. I bought the 184cm length and I wouldn't want to ski it any shorter. As it is, I have moved the binding back a little to slow the tip down some. I can share my impressions of the 78 with you. First off, let me say it has some inconsistent base bevels and needs a tune, which isn't surprising since it is a used ski. As is, the ski has very good to excellent edge grip and hold, but the tips are a bit hooky and it doesn't feel great while riding the edges. This is 100% because of the tune and will go away once I have the ski ground. Ignoring the hooky tips, the ski turns very well, is just the right stiffness for an all around ski (most people would label this ski pretty stiff, but not for you and I). It has a very nice damp feel to it and the faster you go the better it feels. I own a Blizzard racestock GS ski and the Kastle feels very similar, but softer. It is very impressive. Again for our size, not much float in 6" of snow, but that is to be expected. I bought it for skiing glades and moguls without new snow and it works very well for that. I have race skis and wide skis (100mm) and this ski fills the gap. I see myself using it as a daily driver in New England once we start getting some snow and I don't need the race skis to grip the boilerplate. I can tell this is a very special ski and the more I use it, the more I will like it. Need to fix the bottom bevels and get out on it some more. As you have found, you can get a good deal on a used one and they seem to hold up well.
I don't know much about a P1000, so can't comment.
Edited by bttocs - 4/17/15 at 8:58am