Common options are the HW40 (or its cheaper imitations like the P17), the Webley Alecto, and the Gamo Compact.
Can't speak for the compact, but I owned a P17 and it could be a bit stiff to close - you have less leverage than with the HW75. The Alecto is very civilised on one stroke: you can pump it multiple times to increase power but this isn't really necessary for backyard plinking and paper punching. The Alecto has a very nice set of open sights and is well served for rails to attach optics. Some models can also accept a moderator, and with a moderator attached they are extremely quiet, useful for not bothering the neighbors.