Strange question , I think that if you could first define a race rep and then find one we may find that this will be a short thread.
If it includes RD,RZ,TZR,RG,RGV,NSR then far too many of them. Have not ridden a Real one like a TZ or RS yet but have offers to ride an RS125 when Im ready. Not a 2 smoke fan, a race season on one would break my heart, bank account, spirit, and old bones.
the suzuki gt250 is an upgraded t20 which was raced in the 60s so i own a race replica, but i think you woudn't count it as one