I bought an English-spec Air Arms S400K. Did that on purpose, as even though these are set up for the 12 pound limit, the English versions have an adjusting screw to vary speed with different weights of pellets. This keeps the rifle within legal specs, and keeps the shooter out of gaol
With a bit of fiddling about with hammer springs, and tweaking the adjustments, I was able to get it well over 12 pounds, plus have the ability to tune it back for loooooong shooting sessions, even with the smaller air reservoir. Not all PCP's have external adjustments, something to consider, as higher power means less shots. Significantly less, so being able to adjust is a BIG feature in my book.
Mine is also a .22, BTW. I can't stress this enough, bigger calibers + PCP = better results. To put it simply, PCP's are more efficient as the caliber grows. More shots, better power. You WILL get more shots with a larger caliber in any given design.
The other comments are very true. Scuba tanks are much to be preferred over pumps. Pumping won't kill you. It also won't give to "dry" air, nor is it by any means to be considered convinient. It is simply put, cheaper to start out with. And a great cardio work out!
Range estimation, hold over, trajectory. All these will become learned art forms. You need to realize that your aiming point will change even within the confines of the average backyard. Make it a point to create trajectory charts, they will help you immensely. Invest in a quality scope that has AO, that helps a lot.
If you can do so, buy a shrouded version (Air Arms are available shrouded, Falcons are not). Makes the whole experience legally quiet. BTW, the "devices" available for Falcons are not legal here, if that matters to you.
For what it is worth, Falcons have some (all?) parts contracted to machine shops in Pakistan or India. It doesn't show in the guns, by which I mean to say that Falcons are not shoddy. They simply use those places for their "offshore" work, whereas we here in the States tend to go to China or Mexico. Air Arms are all English so far as I know, and the later ones are available with safeties as well.
Lots of rambling here, hope I made some sense.