Eric, there's a lot to choose from.
3 basic categories - springers, PCPs and multi-pump pneumatics.
Prices range from around $100 for springers and multi-pumps to 700 or so. For PCPs, maybe $300 to a couple of grand or more.
I like springers but there are good multi-pumps out there, and the PCP world is quite big.
Just sticking with springers, some nice upgrades from the 34 you have would be a Beeman R9 or larger model (better quality) or some of the magnum class Diana's like the 350.
The big Diana's (350, 460 under lever and the 48 family of side levers) are all best in .22 IMO.
Hatsan rifles all make a lot of power and are not expensive.
Montana Marine had at one time posted a video of one of his .25's shooting through a heavy plate of ice. 3 or 4 inches thick. If that's what you're looking for, the 125 in .22 or .25 is a bargain.
