I'm tossing up between bringing my MX78s and my MX88s. I skied the 88s last year in Utah and Colorado, but it sounds like the snow is still a little scant in Aspen right now - hopefully that will change over the next few weeks - and I care less about the 78s which I bought used and have used on patchy days in the Australian winter. The 78s are also probably more fun in the bumps, but the 88s are better when it's fresher (although if I'm lucky enough to score some truly epic conditions I'll probably hire fatter skis still).
With all the excess baggage fees that skis attract now, and with the exchange rate as favourable for the Australian dollar as it is currently*, I'm also considering travelling without skis on the way there and buying a pair of FX84s when I arrive. They sound like they might be the best of both worlds, and better than either of the MXs for a spot of hiking.
*When I was in the US last February ('09), the Australian dollar was buying 50-something US cents. Right now it's buying 90-something. The gear at Hamilton Sports is going to look even more tempting this year, and so is the wine list at Cache Cache.