ASUS P4T-E: great performance and stability. With the right clock generator, you might be able to get it to 533MHz FSB and PC1066 level RDRAM.
ASUS P4B266: stable, performs well, huge overclocks possible on this board.
ASUS P4S333: fastest out-of-the-box with PC2700 DDR SDRAM, but does not overclock well.