HW Xerun ESC'sare very good. Not a big fan of their 1/8th scale hard wired motors. Below is a list of the best 1/8th buggy combo going, including approximate shipped prices:

ESC ($100): http://www.falconsekido.com/products...t-pro-esc-blue

Motor (~$70): http://www.hobbyking.com/hobbyking/s...or_1900KV.html

Castle BEC ($25): http://www.amainhobbies.com/product_...Adjustable-BEC