Hi Ferrous,
I use a MacKirk Explorer sluice. Dealt direct with the manufacturer in USA. just fits into a standard bucket for quick clean out & can handle good volume. Classify using a 1/2" screen. They're rugged, simple & light.
About $125 inc. delivery to Aust. 8 days.
Quicker & cheaper than going thru an Aus distributor as they don't generally stock this model & they said there'd be extra freight charges for special orders & that it may take a while to get here...
That Ezsluice looks the go too... $60-80 inc. delivery is most excellent!