I struggled with this answer among (in no particular order)
- TCM
- WE (carries the original "Law & Order" series and others)
- CNBC (Shark Tank, Greed, Profit, others)
- Spike ("Cops" and various movies including mob movies)
- ID TV (I like crime shows)
- History Channel (Pawn Stars, Pickers, car restoration shows, some good historical programs)
- Biography (rock bands, celebrities alive and dead)
Spike wins out. It has more variety and not as many repeats, and I could watch "Cops" 24/7.
I'd hate to do without the others, though.