We bought a Delonghi DES16E which retails for around £200 around 6 weeks ago and it's amazing how much water it extracts - it's only just started to get on top of things so am emptying the reservior every two days now. I bought it from energybulbs.co.uk for £157 delivered which wasa bit of a bargain.
The one I actually wanted was a DIO Ruby Dry DH600 due to being quieter, but quite a bit more expensive, but once I found the Delonghi so cheap, the difference was too much for me to swallow so tried the cheaper one.
Only gripe with the Delonghi is that is not the quietest, there is a definate background 'hum', similar volume to a bathroom extractor fan, but we've soon got used to it and zoned it out.
This is our first dehumidifier and have been happy overall with it.
What I did find was that the more research you do the more confused you'll get. I eventually got pissed off with all the minor little differences and ultimately not really knowing what it'll be like until too late. Make your choice and crack on with it