#1 -- DFI Nforce 4 SLI (A64) -- this is my current board (and my all-time favorite)... I have never had a board be this overclock friendly (running my A64 3000+ Winchester at above 2.7 GHZ), rock stable, and it runs 2 video cards in SLI!!!
#2 -- My Chaintech VNF4-Ultra (A64) -- this board was cheap as dirt, one of the first Nforce4 boards available (I had mine before X-mas), was very stable, and a very good overclocker (although not as good as the DFI SLI board. A rampaging power supply killed it before it's time, when the PSU died hard, and I would up getting the DFI board to replace it.
#3 -- Abit IC7-G (P4) -- this board was a wonderful board, and let me easily kick my P4 2.4 up to 3.4! I missed this board when I upgraded to an A64 (athough I did not really miss my processor)!