The most popular usd forks fitted to nsr's seem to be RVF400, NC35, if you go for the CBR1000rr it makes the conversion easier if you use the whole front end, ie forks wheel and spindle, calipers, yolks the lot, saves the hassle of spacers, different wheel bearings etc, iv'e got 04 cbr1000rr front end on an older cbr600 and that's what iv'e got. Good luck with it.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto