I just today received the speed controller from
www.surpluscenter.com and it looks pretty decent. It's labeled as a treadmill speed controller, and has the 3 terminals for the pot, 2 for AC input, and 2 for the 130v DC motor output. All terminals are pretty hefty spade type terminals, and it's attached to a very generous sized aluminum extrusion that also acts as heat sink for the power transistors. All in all, it's a really decent looking unit for $30. Haven't hooked it up yet.
This unit came recommended from Hoss, so I don't forsee any issues with it. If he's happy with it, then I'm sure I will be also. I believe he mentioned that when using this controller, you don't have the green light, just the amber one. Not an issue for me, as I'm putting all my controls into one wall-mounted custom box, which will hold the speed controller, CNC board & power supply, and have all motor controlls on the front of the box. Will post pics when it's done.