Yeah, that DJ Shadow album is amazing (even better on vinyl
For me it would have to be one of these:
Beastie Boys "Ill Communication", listened to that over and over and never get tired. "Paul's Boutique" by them is also good if not even more amazing. The layers seem to draw me in each time I listen (plus you can make a fun game out of identifying the samples they used...)
Daft Punk "Homework" used to listen to that when I threw pottery, just kept me in a zone.
I'm sure there are a couple more, but can't think about them now.