I can start, if nothing else
<<case: style doesn't matter, but it needs to hold a minimum of 4 hard drives and have two 5" bays. these will get filled when its first set up.>>
My experience is...even cheapo ATX-mid cases come with 4 5" bays and room for 4 IDE/SATA hard drives (plus that space reserved for floppies). I had to go back to 2000 or so to see some that don't.
<<ram: ddr or ddr2. capacity and speed don't matter>>
You want DDR2...based on price and availability.
<<hard drive ports: needs to have 6 sata ports.>>
Not true...a PCI controller card overcomes that and will allow as many SATA connections as you like. But there are boards that do have 6 SATA connections, I guess...I just would not say that's a crucial item to consider.
<<video card: doesn't matter. but it has to be able to use a vizio hdtv via analog or hdmi.>>
Actually, the TV should have had cables, I think. If not, they are readily available.
I don't see any consideration for O/S, PSU, CPU, and heatsink/fans...these are basic considerations, IMO, but they need to be considered.
You may be interested in looking at some of the systems (barebone, O/S, no O/S) offered for sale at http://www.pricewatch.com/barebones_computers/