I have bought a Zalman TNN 300 as well and I find the compatible list very old.
I have been running this setup for a long time now and not experienced any problems:
Motherboard: GA-MA78GPM-DS2H (can be viewed here)
CPU: AMD 4850e (2.5 ghz dual-core)
RAM: 3 GB Corsair (DDR 2)
GFX: XFX 9800GT (Green Edition)
But I am confident you can have this setup:
Motherboard: Gigabyte GA-MA785GMT-USB3 (Could not at this moment find a link on Gigabytes homepage for the USB3, however the GA-MA785GMT-UD2H (rev. 1.3) can be viewed here)
CPU: AMD Athlon2 X4 605e 2,3Ghz (Quad-Core AM3)
GFX: XFX 9800GT (Green Edition) (still can't find any better than this unfortently)
RAM: Any DDR3 compatible with the motherboard would do fine I guess