I recommend looking at the climbing kits on Treestuff.com, there are a bunch of options at varying price points:
Treestuff climbing kits
Scroll all the way down and look at everything.
Two comments on the kit you mention:
1. The Buckingham "ring-ring" cambium saver is complicated to install and remove from the ground, the sleeve type cambium savers (leather or Dan House sleeves) are way easier to install and take out remotely, and they cost much less.
2. The New Tribe Pro Gear, Onyx or Tengu harnesses are much much more comfortable than the basic Weaver harness. Harness comfort is important, you're going to spend a lot of time in it.
Good luck,
-AJ