Looking for a battery jump starter kit

[DEL 707]

A recent incident with a flat battery has made me start looking at jump starter kits, since I can't always rely on somwhere to be there to help me with a push start.

I know very little about cars and there's quite a few different kits out there, mostly varying in ampage.

Can anyone recommend a decent kit?

 

[DEL 707]

Thanks for the replies.
I've ordered a Noco Boost Sport 500A, which says it does up to 4L petrol, so should handle my car with no problems.
Also ordered some cheap jumper cables.