I was hoping the "you've already bought it" function might be ready by this sale. I have found myself putting things in the shopping cart, then checking, and finding that I already have them. I'm actually moving the other way---I never bought kits, just tried to cobble things together, but am finding that kits are usually the way I wish I could go, for quickness and ease of matching.
I would love to go through the store and add to my wishlist. I think I'll do that tonight.