OK Larry, I did not heed your advice about buying cheap motherboards: I just spent a whopping $65 on the ECS K7S5A (SIS735) motherboard, and bit more for a 1 ghz/266 FSB Tbird. Heck, the cost of shipping here to "paradise" was nearly 1/2 the price of the board. And wouldn't you know it, the board price just dropped a few dollars.
So far, no problems with the new system.
Regarding the Antec SX830 case, here is what I like:
-The metal RF shield/backplate for the connectors that came with the Antec case already had a knockout for the onboard network connector.
-Lots of space for clumsy hands working near the motherboard and drives. No sharp edges to cut your fingers.
-Easy to remove the top front and side panels without a screwdriver.
-The two 80mm exhaust fans (included) and the interior design of the case (including air intakes) appear to provide good cooling.
-The brackets for easy installation of additional case fans.
-The heavy duty construction.
What I don't like:
-The drive rails.
-The hidden 3-1/2" floppy drive with the remote eject button.
-300-Watt power supply (PP303X) that is AMD-recommended for only a 900 mhz Tbird and lower. The newer version of the SX830 case has an upgraded power supply (PP303XP) which has 180-Watt output on the 3.3V & 5V circuits. So far, no problems with my 1 ghz Tbird, however.