The Leadtek WinFast can be ruled out with one look at the specifications seen on it at Leadtek - We make dreams a reality
I've been dual booting XP along with Vista here in order to even use the tuner card installed.
It doesn't look good for the Yuan model either after seeing
OS REQUIRED Microsoft ® Windows ® XP SP1/2, Windows ® 2000 SP4, or Windows ® XP Media Center
The one model seen that is Vista certified for a pci device, YUAN FUNTV-TUN881, can be looked over at YUAN High-Tech