And keep your eyes on splitboard.com. You can find absolutley killer deals on splitboards there. Keep in mind that that come Feb, a lot of online retailers who sell splits start discounting them. I've seen brand new Voile Mojo's for $500. The price of a good board. Prior models for $800.
Zee, those approach ski's would work. 120cm's is the standard length for an approach ski for snowboarders. Keep in mind that even on a splitboard it's still damn hard work. Get's you fit though and there is nothing wrong with that.