Hi, just to let you know, I went for the Fluval 405 in the end. Setting it up was easy, I had a bit of trouble connecting the RENA Heater to the filter, but soon got that sorted.
It took 45 minutes setting the filter up, and then 5 hours cleaning the sand.
The priming is a bit tedious on the 405, looking at the instructional video, they made it look like 30 seconds of pumping and you'll be away. It was still pushing air out after 10 minutes of pumping.
Anyway, its working fine now, although the tank looks a little empty. I'll have to get a couple of plants over the weekend so it don't look so bare during its cycle.