Nearly any video card should work, the RDRAM motherboards for PIII should support 1.5v AGP signals native to AGP4x.
PC800 is a type of RDRAM and is old enough that it should be relatively inexpensive.
Your CPU's are definately Coppermine cored.
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I thought that PC800 would be cheap too, but from looking at newegg.com and zipzoomfly.com 512MB of ECC PC800 is almost $250. I wanted to upgrade to 1 GB of memory, and obviously, I could get my bosses to spring for a whole new machine from Dell for not much more than that.