In reply to Cadairmanuk:
I've got the cheapest one, the Zip. It does the job perfectly, although if I hadn't got this one so cheap I'd look at the next one up for the push button ignition, it can be a pain in the arse lighting it with a fire stick or lighter if its cold/raining/you've lost your fire stick and lighter.
If you can afford the extra few quid go for the Flash.