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@Alc
If you dont have the shifters then depending on the chainring you might want to run 8spd or 9spd. 10spd would work too on the wheel but its all more expensive and tbh i notice very little difference between 9/10spd bikes. Just need to check what width chain the chainset is meant to take. If it is 9spd then a 9spd system will work better, I've found that using a 9spd chainring on a 3/32 set up (7/8 spd) with no front derailleur has a tendency to drop the chain off the chainring a lot. A dog fang will help a fair bit. Or get an old non working front derailleur and set the limit screw really tight so it acts as a chain device.
Something like this would be a fairly reasonable cassette http://cgi.ebay.co.uk/Shimano-HG50-8-Speed-Road-Bike-Cassette-12-25-NEW_W0QQitemZ360138725508QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item360138725508&_trksid=p3286.c0.m14&_trkparms=72%3A1688%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318
If you get a bigger range one - like for a mtb make sure the rear mech you get can cope with the teeth range. I think this is okay on a single ring set up, but more of a problem on a double.