Looking for a few good piston-fillers

[Sailor Kenshin]

Why I went from disliking piston pens to being obsessed with them, I could not say. But I would appreciate suggestions for some bargain writers (certainly under $100....hoping more for $50).

I already have two or three Pelikans, and a handful of Wing Sungs, Dollar Demonstrators, and TWSBIs. A Lamy 2000. One lone Wality (52P?), with which I am in love.

Ink window a must. And I like them fat but not heavy. Thanks!