OldMan, I do have a mixed set. I'v never really worried about mixing tires on my bikes. I 've even run recaps on the rear with no problems at all. They were $95 for a 190 rear. Sadly they stopped making them...
Lately my budget has been so tight that I've been running used take offs. The way this thing goes through rear tires it's the only way I can keep a tire on it!!! When I can buy new, I'll probably go with a set of Michelins or Pirellis.
Mad