I've had a few PCP rifles, but I'm too lazy to pump and the whole scuba thing was a pain with no scuba shops in my area. I'm also picky so got too concerned with shot strings. With the various PCP's you find you start at at one velocity, it may climb a bit, then it will start dropping off. You'll get X number of shots at an "acceptable" velocity before your zero start dropping off.

A multiple pump doesn't give you you the varying velocity problem, but they you get right back to the pumping part frown

I'm a springer guy at heart. On the budget end, the Benjamin Trail gas ram guns aren't bad for them money. If you don't mind stepping up a little in price range, the various German made Beeman or RWS imported guns are great.