Crosman 1322 or 1377 pump ups, but lots of pumps for one shot at max power and a bit long
Crosman Ratbuster or any 22xx series gun - CO2 power
EB22 - Co2 Powered, a neat compact pistol
Webley Alecto, 2 to 3 pumps for max power
A few Brocock Atomics have gone on here for £170 recently but you'd need a pump or bottle for filling.
- Nick