How much do you want to spend, and how much time/effort is someone willing to go to to sort everything out?

A reasonably top-end PCP with dive tanks or pump etc will be maybe 2 grand to buy, then the tanks have to be lugged around and refilled, or the gun pumped up again etc

My favourite - a second hand FWB 600 series - removes the tanks and maybe £5-700ish. Advantages of pre-charge without the hassle of tanks/pumps, disadvantage of weight of charging mech and having to pump a little each shot.

A good second hand springer (eg FWB 300 series) should be 2-300ish and will take a decent shooter a long way.