The KTM is a 500 exc more suited for the street. The husky 450 fs is a straight out of the box race bike and pretty high strung. I would not want to use it for the street. My 500 is built to race and then i can toss my tail light plate and headlight on in 10 mins and go for a street ride. That what I love about it.
Mostly 450's but most places that race supermotos will have an open class which you can run 525, 560's 701's ect. 71 is kinda a big bike to race as a supermoto.