Castle has come out with a new Sidewinder ESC. It is the 'SV2' - I think it is cheaper than the original Sidewinder.
http://www.castlecreations.com/produ...inder_sv2.html
If you want a simpler esc I would try a Losi MSC12L (not bad for the price).
http://www.horizonhobby.com/Products...522#quickSpecs