Which Dremel?

So my Masterlock bike lock failed this morning, leaving both my bikes chained to the wall anchor. Had to get the bus in! So I need to cut the chain off. It's 8mm hardened steel. Good excuse to get a Dremel as I've a few other jobs that need one. So would the cheapo 200-5 be good enough? The cutting disc supplied with it says it's OK for hardened steel. Or would I be better off getting the 3000/4000?
http://www.diy.com/search/results/?question=dremel
http://www.diy.com/search/results/?question=dremel
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Ribble Gran Fondo, Campagnolo Centaur (winter bike)
Van Raam 'O' Pair
Land Rover (really nasty weather
OK, thought a Dremel would be strong enough but I'll look at grinders. Cheers.
Get a cheap tile saw from Wickes/B&Q, - it's the sort with a round 'gritty' blade.
It'll take about 20 mins.