I have a future version of Risk called 2210 A.D. It's a lot of fun, and the addition of water and moon colonies, commanders and command cards, and energy income makes the game a lot more deep. Also, the game ends after a set number of turns, which makes it a lot less time consuming than original Risk.
I don't consider myself a board game person, though.
Here's a Risk-like game I play from time to time:
http://gamedesign.jp/games/dicewars/