Let's try to add a cap of the top 10 most-wanted items ;o
My list, i'll just use + or - depending on the priority:
+ MGS2 black/white ultimate sorters, IF anyone will ever sell them

+ MGS shareholder gold premium package
+ MGS3 Medicom tigerstripe/naked Snake figure
+ some BIG set/lot of Japanese promotional stuff
- MGS3 or MGS4 life-size statue

- Metal Gear 20th Anniversary clear Snake & Big Boss figures
- MGS drama CD vol.2
- MGS4 Medicom olive drab Old Snake figure
- MGS:PO konamistyle premium package
after I'll grab 70% of these items I'd start to aim to more sealed OSTs and games (as you may have noticed already, i haven't been too much into sealed games collecting) and some more posters & promotional items.
(this might also help to exchange infos among forum users)