My collection is relatively small - I try to not to pick up stuff I don't necessarily need. If anything I'm trying to downsize a bit. However, if you find something on my tradelist you could use, here are my collecting priorities, in rough order:
1) my three primary player collections: Kevin McReynolds, Keith Hernandez, Pete Harnisch. Those are, admittedly, really hard to hit because I've got almost every major release from those guys.
2) autographs from everyone who's played for the Mets. Again, hard to hit because the majority of the guys I need either don't have certified autos, are old/deceased, or both. However, they don't need to be in a Mets uniform, which opens up the pool a bit. My need list: https://docs.google.com/document/d/1qwZl3ADQSf_gVoFHtuS6t3hRaaHnEzRZ3N3h7sJtjkQ
Those are the big two; knowing that those are hard to hit, though and knowing that I just really enjoy trading, here are other things that catch my eye:
3) 1960 Topps. Picked up about 60% of this set from a friend and figured "what the heck, let's go for it." I'm down to TWO cards! But they're the two Mantles. Looking for these in poor condition at *best,* and I have other vintage stars (including a 1962 Mantle) that I'll trade for them.
4) Mets parallels, but specifically parallels from guys who I really like. :) Mookie Wilson, Ron Darling, Sid Fernandez, Wilmer Flores, Doc Gooden, Francisco Alvarez, Edgardo Alfonzo, and David Wright, mostly, with guys like Nimmo, Alonso, and Lindor as other options. It's a moving target - sometimes it's just a feel thing. Don't need base, don't need inserts, necessarily, unless they're particularly eye catching.
I'm generally pretty easy to trade with, I think, but if you're interested in something valuable or vintage, I'd need something valuable or vintage or off my real wantlists. Thanks for looking!