When people used to say, "buy cheap" for an ESC, they generally meant the HobbyWing stuff. It offered good value from the company who is the OEM mfg for many others. These days, a HW 3.1 costs almost as much as an Orion R10.

If you're running mod 2w buggy, you need, and I can't emphasis this enough, the smoothest ESC you can get and those don't come cheap. I can't remember the last time I've personally saw anything other than an R10 or LRP Flow in a mod buggy Amain by me. You'll be happier in the long run buying a used R10 (my personal favorite ESC) for what you want to race than something "cheap" new.