Haven't been at it long, so I'm far behind you. I do have the 48, 49, 50, and 55 (my favorite), and have 72 plus 74-77 en route from a Boardie. A few other scatttered nice issues like 6, 10, 14, 24, 25, 27, and so on... so working on it.
A sweet presenting FF 13 with great PQ and at the right price is going to be a real challenge for me, I know.
I'm scattered from 13-30 and solid after 30 up to 104. Been working on the early run for a few years and now starting to get into the really expensive ones. Probably another 5-7 years before I'm solid from 1-100.
May go after a few between 1 and 5 this year at SDCC. Working on my 'war chest' now.