That is a super review Bingo13, thanks for the link.
I'm also looking at building a P4 system and thought I knew what I wanted.
SiS645 board, probably the Asus P4S333 since it's only a few dollars more than the also good ECS and MSI.
Best Northwood for <$250, maybe a 2.0, we'll see..
Crucial PC2100ddr(which based on that review is going to have to run at PC2700 and maybe will)
But with the recent increase in DDR prices and lower rdram prices the picture is a bit more hazy.
Asus P4T-E (about $50 more for motherboard)
pc800 Samsung rdram (about $40 more for 512mbs worth, hopefully can be run at pc1066
same Northwood as above.
So for not that much money it's a substantially faster system at defaults(rdram800 vs pc2100), and potientally much faster overclocked.
Random thoughts-
rdram at pc1066 is going to be a big jump over the already faster pc800, I think.
overclocked Northwoods are going to be quite speedy.