I don't buy a lot of addons... and they are mostly games... not addons. Ordered from favorite to least favorite
1. Perfect Dark (XBLA) $10 (really they fixed the framerate (really big deal for me), and character models improved one of my favorite games ever)
2. Wipeout HD Fury $30
3. Lara Croft and The Guardian of Light (Really Awesome 2 player Co-op) $15
4. World Of Goo (Awesome Puzzle Game) I forgot how much this was
5. Mass Effect 2 DLC Shadow Broker and Overlord (overpriced imo, but great) $18
6. OoT... one of my favorite games, and I no longer have an N64 so good purchase $10
7. Mario 64... Ditto $10
8. Majora's Mask... Ditto $10
9. Final Fantasy VII (waste of money, I don't use it on the psp that much and I have the PSX and PC version) $10
10. Fianl Fantasy VIII (Ditto) $10
11. I dont know why I bought this Folklore DLC Never even played it :-/ $20
So about 150 dollars.. more tahn I thought.