There is an added problem with prop driven pumps from the friction between the magnet and base of the shaft... the prop pushes the magnet back into the pump. This has caused problems for a few prop pumps in the past that centrifugal pumps dont suffer from.
I dont know why they just dont have a floating magnet assembly that relies on the magnet alone to keep itself in place... no friction then. Anyways... thats a tangent...
Those prices on the Polario dont tell much. The price in the US could be the same or 2x as much. Having just come back from the UK, I can tell you... the pound is all over the place. nasdaq needs to finish its takeover of the LSE, Scotland needs to declare independence already, and the whole UK would then wisen up and adopt the Euro finally or it would be in real trouble sticking with the pound. As is, the pound is a little over 2x the value of the dollar at exchange, but in the country its worth about 1.2x if that. The UK as a whole is losing its industry because of this (who would import from a country with such a horrible exchange rate?), and its only big business is in finance (Royal Bank of Scotland movin' on up does nothing for the commoners).
Anyways, that price could mean anything.