My Weihrauch HW 75 single stroke pneumatic is a fantastic pistol. Maybe more than you want to spend, though, at about $450 or so. It's the one on the bottom in the photo below. It comes in .177 only, mostly because its power plant probably would not be powerful enough to impart much velocity to larger caliber pellets. It is, however, completely recoilless and extremely accurate and easy to shoot.
Above it is my HW 45, a spring piston version of essentially the same pistol. Weihrauch touts it as the "most powerful" air pistol available today. Mine is in .20 caliber, but it is also available in .177 and .22. And yes, it is very powerful. Difficult to cock and difficult to shoot well, however. It has a lot of that weird spring-piston "recoil" that really makes it jump around.
Weihrauch used to make a far higher quality version of your Beeman P17, sold as their HW 40. It was about half the price of the HW 45 or HW 75, in the mid $200 range. I'm not sure it is still available, as I do not see it on anyone's web sites. I love this pistol - I've actually won some matches with it, against guys shooting "real" match air pistols. It might be worth looking for one.
