the 675 is a great bike(triumph)
try the fz's as well . the newer fzr looks nice. the suzuki gsx650.(I think)
I would stay away from 750's and 1000's. really no need for it. you will become a better rider with less power.
is the motor the same in the 84 xl250r as the 84 xr250.
I assume there should be a more aggressive cam in the xr model. but I want to make sure the head is the same as far as journels go and what not.