For that amount of money you could buy a full-bore racing Phantom 23 with about 800hp, 100mph all day every day!
The secret would be HVLP (High Volume Low Pressure). You can see a guy in the video put his hand under the jet, and it`s not that high pressure.
And the pack is only the nozzles and some controls, since the pump is housed in the little speed-boat looking craft the pipe attaches to, so will be extremely light (<10kg at a guess.)