What range do you want to be accurate at? Like NoLandBeyond said, that's important. I've got a Marauder that is incredibly quiet and can stack pellets at 50 yards. I disagree about being sloppy with a PCP, but other than that . . . . . anyway, so many to choose from. Range and budget really control the choice.
Oh, and the new Fortitude is supposed to be accurate at under 75 yards, regulated and even quieter. Fortitude has a crappy trigger though, where the Marauder has an excellent adjustable two stage. and Yes, I am a trigger snob, I like a lighter, crisp trigger.
If you want to go the extreme other end, spend lots of money and get really bored with single ragged holes at 50 yards, FX Impact with a Donny FL. That'll run you $2300 or more without a scope. Marauder will run $500 or so and might include a scope, depending on where you get it. Don't forget the fill system, and some kind of tank. If using a pump, do take a look at the Fortitude, small cylinder, much easier to pump.