I was surprised the N504 didn't sell for more to be honest. I don't think I've ever seen one for sale on eBay. But equally surprised the controllers sold for as much as they did.
Nuon N504 Console [PAL]. This is the very rare European model which has RGB scart output. This model was sold only in Switzerland, and for a very short time. Includes Tempest 3000 and 3 Nuon controllers. DVD playback is unlocked, so is region free. The (brown) HPI controller doesn't work and is...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160398810199&ssPageName=STRK:MESELX:IT
As you'll all know by now, this can easily be moded to support Nuon controllers.
Iron Soldier 3 (with original retail box and instructions - this is not the disc sent out from Nuon Dome):
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=160205248169&ssPageName=STRK:MESE:IT&ih=006
The Next Tetris...