My first post, yay!
Transformers are my primary collection, my entire spare bedroom consists of about 500 figures. All of the 1984-1988 original, vintage figures sit in glass cases while some newer releases and Masterpiece releases sit on shelves around the walls. If anyone doesn't know what Masterpiece figures are, Hasbro realized how nostalgic the original toys are so they created larger, more detailed, higher quality versions of the 1980s figures with a lot of die cast metal and called them the Masterpiece line. They sell for $100 - $500 each, I probably have half of those.
My secondary collection is NES. I currently have about 600 unique games with almost 400 boxed, I'm going for a complete boxed collection with all variants which means I need 2 copies of Stadium Events.....3 screw and 5 screw. My video game collection takes up 7 bookcases in my basement.
My third collection is Atari 2600, I have about 400 games right now with maybe 150 boxed. That includes some pretty rare titles like Spider Maze, Berenstain Bears and Bumper Bash. Most of these I got for free from my old boss.
I'll post pictures when I get home.