Ooh, this isn't easy - my all time favourite has to be the .177 TX200hc that I've got now.
It's my third TX so, I've made sure that I've got this exactly as I want it - I love taking it out of the bag.

Most memorable have to be a .177 Cricket and a .25 Matador - both built like a tank and, both awesome hunting rigs in their own ways.