Thanks Bob.
That is obviously way more than the current bid on the first auction, but two things to consider are -
You'll need those extra bits anyhow, and they're probably not cheap (you also need a pump)
And..
Nathan will, I'm sure, do you an off eBay deal for less.
Or he may be happy to just sell you the pipes gauges valves etc to go with the used one in the first listing -,worth asking.