Awesome. You're a 90's guy like me.
Mad Season - a tad mellow, but it's another full album of Layne so it's a must have.
Tool - anything by them is brilliant. My personal fave is Lateralus, but none of them will disappoint.
Soundgarden - Badmotorfinger, Superunknown.
If you like Iron Maiden, then Rock in Rio 2001 is a great choice. Flawless performance in front of a crowd of 250,000. I don't know about anyone else, but studio Maiden doesn't hold a candle to live Maiden.