Diablo 2 + LoD is one of the best games all time. I would still be playing Diablo 2 but my friend downloaded a maphack and got my account and cdkey banned, the cdkey I've used for 9 years.
ANYWAY - I'm waiting on Diablo 3, which probably won't be as good as Diablo 2 - but Torchlight is amazing. Torchlight is made by the developers of Diablo and Diablo 2, you will find TONS of things that are exactly like Diablo 2.
If you liked Diablo 2, Torchlight is a no brainer.