Well for official 333(166fsb) support, the 2700+ and 2800+ have it, and anything after that. Unfortunately, they're not out right now. So you can either wait until about December or January(most likely for 2800) or buy their top of the line right now, which is the 2400+.
Athlon XP Speeds:
1500+ = 1333MHz 266FSB
1600+ = 1400MHz 266FSB
1700+ = 1467MHz 266FSB
1800+ = 1533MHz 266FSB
1900+ = 1600MHz 266FSB
2000+ = 1667MHz 266FSB
2100+ = 1733MHz 266FSB
2200+ = 1800MHz 266FSB
2400+ = 2000MHz 266FSB
2600+ = 2133MHz 266FSB
2700+ = 2166MHz 333FSB
2800+ = 2250MHz 333FSB