I've got some no name 4x scope on the Mark II that I bought at Dicks as a package. I can put up some pretty good groups on paper. My boy and I have taken to shooting paintballs at 50 yards. With a good hold it is no problem.
On my BV, I have a Centerpoint 4-16x I got from Wal-Mart for $70. Same results with that scope. Until either scope lets me down in some way, I see no reason to spend more on an expensive scope. It's not like the .22 round has a heavy recoil to jar the scope. They probably take worse riding in the cases on the way to our shooting range.