I have several choppers, some have been mentioned, but for an affordable chopper I like these...
Ontario Cutlass Machete, convex the edge, and modify the handle, and then you have a great chopper, all for $20 and some effort.
Ontario SP8, thick, strong, but doesn't bite like thinner blades, but very good.
Ka-Bar Cutlass or Kukri, good edges, come shaving sharp, and both bite in very deep. The handles are fatter than the Ontario rubbers.
More pricy options, that I have used are...
Junglas, just great, light, and has an excellent handle, and sheath. A good handle makes all the difference.
Bark River Golok, pricy, but has a thick spine, lightweight, very sharp, and will slice like crazy. It's handle is a bit long and skinny, but is comfy. The golok is not the most powerful, it's a good choice for many.
My favorite is my Culberson Bolok. 13/64" thick 5160, 12" blade came shaving sharp, and still is. Bruce makes excellent blades, handles, and sheaths.