21R in top nick is worth absolute tops (it would have to be showrrom) £1500
My R which had just had a new crank was mint under the bodywork but the bodywork was a 'little' tatty went for £1200
I bought my SP for £1500 but I beleive I got it cheap, I have seen some people recon you can get an SP for this or less but I have yet to see them.
To me right now my NSR is priceless but in the real world I recon it would fetch £2200 ish on E-bay, but would take £4500 right now LOL (so not quite priceless).
I think 2.5 is to much for a 21R with Tyga bodywork and a proarm (why would you want a 80s style swingarm ) knoock £500 off and you are closer the mark.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold