I have one of the new CZ 634's, which I am rapidly growing very fond of. Insanely accurate for a spring air gun. At 25 meters, it will consistently shoot groups you can cover with a dime - in the bullseye all the time, no wandering! And that just using cheap Gamo pellets ($12 per 1,000). It's supposedly tuned to Brit laws (11.5fpe/720FPS), though that's enough for small cirtters (and I've read several reports of guys with chrongraphs showing 800fps+ with the 634's).
In air guns, as with big guns - accuracy is 100% critical and you can't do without it. More velocity/bigger bullets are only nice to have, assuming you've got enough to start with.
My only complaint with the 634 is trigger creep. It's very light (and adjustable down to the 1lb range I might add), but there is some distinct creep in it. Haven't taken it apart yet to see if I can fix that or not.