Boot weight is every bit as important a consideration as ski weight, if not more so. Alpine boots suck for skinning, the steeper it is, the worse they are. You can save more than a couple pounds on each foot with some models of AT boots, which means you potentially save thousands of pounds of lifting over the course of a serious climb. However, what you give up in weight, you usually will lose in stiffness, in the power over your skis movements, and in the support which make it easier to recover from loss of fore/aft balance. What's good for going up, tends to be less desirable fro going down.
As for skis, assuming that you'll be hiking to find untracked snow, then anything wide enough to float you will do. Wider generally means heavier, so the more float the ski will give you, the more work it is likely to be on the way up the hill. I tour on 183s (my shortest skis, length means weight too, of course) with dimensions of 121-92-105, with a medium overall flex, and have never felt like I really needed bigger skis. I'm a pretty big guy; I usually ride skis 188 or longer.
If I were you, I'd be watching the gear swap on TGR, as not infrequently, people sell full AT set ups (skis, bindings, and skins) for hook-up prices. Boots too. TGR has a much higher proportion of back country skiers than epicski, which means a much deeper resource base for gear, and gear knowledge. There are some very knowledgeable folk here too, but relatively few, and not so many of the screaming deals here either. However, be forewarned that some folks are choosy about who can come in and swoop up the deals on TGR, and one can expect to be met with derision for swooping deals if you aren't otherwise involved in the forums, but some folks have no problem with selling to anyone who's Paypal is pumping.