Any brushed ESC that can do 12 can run a CIM, you'll want something that can handle around 20-30 amps at least.
http://e0designs.com/products/ragebridge/ I love the Charels Guan series of Rage 1 and Rage 2 now ESC, pricey but works great with current limiting. And dual channel on one board.
If you're looking for cheap you can get that Andymark "cheap quick" ESC direct from the hobby world for real cheap something like this:
http://www.hobbyking.com/hobbyking/s...dProduct=81505 Hobbyking is a great place to get cheap RC electronics, and electronics in general. Make sure you select to buy from the USA warehouse (stuff shows up in about a week).
They work just fine, just not fancy features and are usually overrated.