WSS....there are a lot of choices for part numbers for Powermax85 systems.
What you need is a power supply with the CPC port, a 50' machine torch, and an interface cable.
The interface cable plugs in the rear panel CPC port. There are two versions...one has plasma start (2 wires) and arc transfer (2 wires). The other has those two signals as well as divided arc voltage (2 more wires).....and is available in 25' and 50' lengths.
You can also get a version of the Power supply with a serial interface.....which has limited use on only a few select cnc machines (CandCNC.com machines just announced their ability to serially interface to Hypertherm plasma, and any cnc machine that uses newer technology cnc controls from Hypertherm...such as the EdgePro and the MicroEdge cnc control.
There also are packaged versions of the Powermax85 with both a hand and machine torch, and interface cable....this makes it a little less expensive than purchasing the hand torch separately....if you desire a hand torch as well.
Let me know what your needs are and I will help you select the right part numbers. Make of cutting machine....torch height control, etc.
Hypertherm tech service can also specify the correct part numbers...as can Hypertherm customer service.