New system up and running.

Gigabyte EP45-UD3P (this is one solid-feeling mobo with a lot of expansion room)
4GB Kingston memory mentioned before
New Hauppauge HVR2250 dual-ATSC tuner
Gigabyte ATI Radeon HD 4350
Plus the drives and cards I had before.

Right now I have 6 active tuners in the system. The NTSC tuner will be removed once I cancel my cable subscription and go OTA-only for a few months.

I'm quite impressed with the mobo in comparison with the ASUS. Seems better built and nicely laid out. It's also got a great amount of connections, including 12 USB, 3 Firewire, 2 GigE LAN, 8 SATA ports (6 Intel and 2 Gigabyte), 5 PCI-e slots (2 x16 and 3 x1) and 2 PCI slots.

The Slipstreamed CD I made failed to install any of the third-party (new/additional) drivers. I'm not sure why. I had to pull them off my other system's download folder to get all the new devices configured.

The only complaint/oddity I have is that the mobo brought up my CPU as 2.26GHz instead of 2.66. It was using a multiplier of 8.5 instead of 10 on a 266MHz clock. Its memory voltage setting at "auto" was also over-clocking my ram a bit at 1.9v. I manually set it to 1.8v.

Going to have to burn it in using Prime95 in the next couple of days.