Not sure what you consider to be "medium weight"... but the Air Arms TX200 used to be a severe competitor to the HW97k. My HW97k was Lazaglided... and at the time, it was every bit as good as a tuned TX200... and the other way around as well (with the TX200 having a slight edge because trigger...). The HW77, the HW97k and the TX200 were considered to be the Dog's Whatsits in spring gun land.

None of them would be considered as "light-weight", though.