Well, the specs on the boxes of the new guns say in the range of 650fps for a mid-priced airgun (around $100) to 1000 fps for a $200 (and up) airgun. I've heard reports that, at the high-end, some of the guns go supersonic.
1000 fps is probably faster than a .22 short, but I don't know the weight of the pellet in grains, so not sure it would hit as hard.
I don't think a .177 at 1000 fps will hit as hard as a .22 short, but I could be wrong.
A suggestion--find a friend who has a chronograph (or find someone using one at the range?) and ask to fire a few rounds through it. I'd be interested in the results. When I was a kid, those Crossmans at 10 pumps had a reputation for power. A few years ago I got my kid one, and it seemed like a wimp. Not nearly as accurate as the old ones, either. Very disappointing.