Personally I wouldn't pay more than £2500ish or max £3000 for a mint low mileage with history. If you look around, like the post above from blade for instance, you can find quite a few pop up during the year. Not a quick process as they are limited, but possible.
You're best bet is to look at ads other than those from members of this site, and on ebay, as the smaller ads and bikemart are where you can usually find the bargains at more reasonable prices.
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NSR300R - Why did i ever have a 250...