Very nice collection indeed. I love to collect Rockstar stuff as well. I'm glad to have a Piggsy statue from Manhunt, which is limited to 500 pieces (see pics below). I have some GTA 2-stickers I can swap or trade, and brown bag with the Rockstar logo (you know the little paper bags in which they hide bottles of alcohol in the USA). If you're interested in European Rockstar-games, let me know. I'll see what I can do.
cheers