The PCP is easy on scopes. Most any scope will be fine.
I like the Hawke Airmax 3-9x40, it was $239. There are a lot of lower priced scopes that would work fine.
The piston guns like the break-barrel and underlever/sidelever are the scope killers. My Hatsan 125 wrecked a Hawke 3-9x40 in under a dozen shots.