5150s. The originals have already gained a bit of resale value since the introduction of the 6505 series, but I can imagine them becoming much more valuable in a few years as a LOT of bands/artists have used them to create definitive tones.
Blackmachine guitars. They are a relatively new company, but they make great guitars. Already some influential players are starting to use them. I'd give it a matter of time before the company gets a higher profile and people find reasons to say that the older ones are better than the 'new' ones.
Bareknuckle pickup prototypes will probably fetch a LOT of money when the timing is right as the companies reputation and profile are getting better and better... If BKP ever discontinue a pickup, I'm sure that particular model will command a high price too.
Thats my views anyway.