MC18 fetch odd money. Sometimes you can pick a very clean one up for £800. They normaly range between £500-£1000 (of course dealer prices will be higher). However MC18's prices have been going up a little bit of late.

MC21's (the most popular NSR250) start from around £800 and go all the way up to over £4000.

Depending what you want from your NSR depends on price.

Quite oftem a £1500 MC21 will have just a good engine as the £4000 one. However it will not wear the same standard of body work. Thats very important if you are after a genune SE or SP model.
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If I have to take the carbs off once more...