I recently recommended an HW99 to a friend. I shot it and I was very impressed. So light, full power and deadly accurate even in standard form.
I do like underlevers like the hw97 hw77 or tx200 but the weight ruins the enjoyment unless you are stationary target shooting. I gave the HW57 a go it feels like a lightweight HW77k perfectly weighted.
So my recommendation would be Weihrauch: break barrel HW 99s or underlever HW57