I'm not sure what your budget is. I would recommend the Kalibrgun Cricket in 0.25. No other gun has put a big a smile on my face or surprised me as much as that gun.
I own many PCP's from Daystate, BSA, Brocock, Air Arms, Airforce, and Walther. The Kalibrgun is my go to "long range sniper". In fact, the majority of my 50+ yard shots are taken with that gun.
Just dropped three pest squirrels this morning around my feeder from between 55 and 70 yards. So much confidence in shot placement and accuracy that I just have to make sure my ranging is accurate and my trigger pull is consistent. The gun does the rest.
Bullpup, lightweight, regulated, quiet, high shot count, and delivers over 50 ft lbs at the muzzle. Can't ask for anything more.