UDMA69, i agree w/ your choices for your new system...except for a couple things, as follows:
Since u like Cyrix, the Cyrix MII PR300 and DFI socket 7 Mobo can be had for $200, perhaps more if u look harder, and should provide u w/ awesome speeds as well as future upgradeability (i.e. AMD k6-2 500).
u won't be able to use Rdram...but PC66 is as rare
i would oc the cpu using water-cooling (or waterblock, mineral oil, liquid freon, etc.) at up the bus to 75mhz
get a geforce 2 ultra agp (apg, which works raelly nice w/ mvp3 chipsets) since your vid card will be the bottleneck in that system, thus u need the fastest vid card possible, for noly $750CDN..
the rest, u can figure out yourself...
good luck