I really can't whine too much, lately I've been selling knives that were redundant sizes/styles and keeping the cash at the ready for when a grail of mine becomes available at a fairly decent price.  I've been lucky enough to snag most of what I've been after.
For me the one that I really wish I had been around for was the Busse EU-17 Magnum.  It was a numbered military over-run, very limited numbers.  I saw one come available a couple of years ago for a price that I thought at the time was just a bit too high.  Well, I hadn't done my research and it ended up being a rediculously low price.  Ah well, I still keep an eye out....
I noticed the Swamp Rat Vex is on a few lists.  I have one and it's one of my top three favorite knives.
Great thread by the way.