I was looking at that one but the only thing that put me off was the size of the bottle, but thats just me being lazy not wanting to buy new bottles once they run out, apart from that its got everything you need.
Well I'd find one without the fe so postage would be cheap then get a co2 fe on eBay I have 3 just from my old job in the garage I just can't be bothered to get the other bits needed.
I think you need an adapter to fit this set to a fire extinguisher. The bottles are inexpensive though as replacements can be bought from halfords in the form of welding CO2, but if you can get an FE then you may as well go for that.
The set in the original post is the one that I have and I think it is excellent - typical of the quality that you would expect from D-D.
The only thing that I would say is that the diffused wasn't much use on a larger tank (350l)so I replaced it with something more effective - although it may be just fine on a smaller tank.
You can also buy an adaptor to attach it to re-fillable type bottles
I would just keep an eye out on ebay for a jbl kit, I got one complete for £75 and have since got two 2kg jbl bottles for £10 each. Be patient something always comes round.