ok, i dont know a lot about tires, and from what i have noticed i need H rated tires. my questions are: do i have to have H rated tires, since i am only replacing one? if i dont get an H rated tire, will that affect anything if the rest are H rated? i have looked at some douglas touring that are H rated, and some bfg tires that are H rated, both right at $60. basically, i am looking at just getting a tire that is a replacement so i dont need anything fancy, but what tire that walmart has would be the best? i assume the douglas arent as good, but once again i know nothing.

size is 195 65 15 89H

thanks