Well, with all success comes a tiny bit of failure. I had to ditch the HVR-1600 card for another PVR-150.
Why? Conexant CX23418.
The 23418 is the upgrade from the good ol 23416. Among other things, it fixes the DMA nightmare that makes Hauppauge cards almost impossible to use on a board with a Via chipset (horrible DMA on a card + horrible DMA on the southbridge = PURE NIGHTMARE). The downside is there were so many cooks in the kitchen that nobody really knows exactly how it works. The dev team on the xxx16 chip apparently left and didn't document everything, along with other speedbumps in the process.
Long story short, 23418 support will be a little ways away, hopefully not *TOO* away seeing that Hauppauge is moving to the 18 chips on just about everything.
Once 18 support comes about, I'll grab another HVR-1600 or two.