There are a couple of other options, besides those covered, that may suite, depending on your circumstances. eg
I opted for an
ibrew setup, for my recent delving into homebrew.
The main reason was for the 10 pint at a time
tap-a-draft dispensing system, which is just about managable in my fridge.
I got mine for £60 inc P&P
http://www.thethriftyshopper.co.uk/homebrew-starter-kits.aspx
Minimal range of refil kits from trheir own range but the fermenting bin is big enough for standard sized kits, though you need another 20 pints worth of storage vessles ( eg 2 more of the same bottles or 6 or so 2lt pop bottles )
The brupak brubox kits are worth a look, if you'd like to get several different kinds of brew on the go and don't have a great deal of space, being 10lts a time
Personally I'd like to find a CO2 dispensing system that screws onto a 2lt bottle.