Hello, [
Buying an NSR is a bit of a lottery it seems but the MC21 is the best bet, the MC28 is better looking though.
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Price dependant of course go for the best most complete good condition you can afford, mine was a bit expensive but touch wood I haven't had an trouble other then the speedo drive, if you use a dealer usually you have more security but SlyFox has had problems in that direction.
The best way is to take someone like Andy with you to check it out and get everything in writing, provenance etc.,
Good Luck, DUX.