Dave, back in late 80s I had an XT250 the wolf in the street year model ( I know not a world beater) my mate had an XR200 around the same year as mine, both bikes had some work done, and weren't slowish. Side by side off the mark I would keep with him til middle of 4th, and he'd start pulling away. I never had a ride on his bike, tho. So can't compare.
I once took my IT490 to get serviced, and the mechanic there said he used to pit for a rider who raced the IT200, and told me to ditch the beast, and try to get one. Said it was a well balanced bike, with usable power, handled well, and I would not be disappointed. He also said the KDX200 was a choice bike as well.
I didn't know you could get PE parts, especially 175 parts, so readily. A few people who I know whom have owned them, reckoned it was a struggle for parts.
Good luck whichever you go Dave.
Cheers, Mark.