I now have a 21 litre Marine Master 'EziStart' freshwater aquarium. It measures 44.5cm (L) x 38cm (H) x 20cm (W) and weighs about 25 KG fully loaded.
It's very pretty at night.
The kit, out of the box, comes with the tank, the light and the pump/filter. You need gravel, a pH kit, net, and plants (if you want) separately. You also need a heater for tropicals, so I also added a 25w aquarium heater to my setup (tropicals are the way to go, much cleaner).
At the moment it's burning in for about a week, to get the water aged and settled, before I add in a little sacrificial Corydoras to really get the tank ecosystem going. They're hardy little fish, I've been told, so maybe he/she won't be so sacrificial in the end (which would be nice).
After the aquarium is all set up and able to support life I'll add some nice fish that shouldn't die =D I'm also very aware that this may become addictive xD