The Ragebridge 2 is a well regarded two channel brushed ESC in a reasonably small package http://e0designs.com/products/ragebridge2/

The Robot Power Vyper is a single channel ESC with a high 120A current capacity. Its a bit overkill for most featherweights but would work well in a pushy bot that has lots of traction http://www.robotpower.com/products/vyper_info.html

The IFI Victor 885 is another high power 120A single channel ESC. Its a bit old school but still very dependable and most compact than the Vyper. http://www.robotmarketplace.com/products/0-238.html