If I have any advice, it's don't be afraid to sell stuff (to fellow GHers in the classifieds, or on eBay).
Collecting is cool, and I certainly have far more keyboards than I can use at once, but it's also not a bad thing to live with a board for a while, get to know it's quirks, and then pass it on to the next guy.
There are so many different switch types, layouts, keycap qualities, that you can end up buried in boards if you're the curious/investigative type, and aren't as excited about selling the old ones as you are about trying the new ones (and no one is).
Enjoy!