Watch the discount sites if you want to go online, if not, go to that local MW hill and see what demos/2010 product they have left over. Definitely TRY BOOTS ON, and buy them in person. The board and bindings can be bought online. For your experience, you don't need anything fancy, but put the money in the boots if anything.
I would recommend going a bit shorter, like 156cmish, but 158 would be okay. I'm 5'7" 160lbs and ride a 154 for big mountain, and 151cm for the local MW ice hill