You definetly need a 350W or better PS with the 1.33. Some run it with 300W, but 300W made my system very unstable. I have the POWMAX 400W (6100D), but it isnt on AMD recommended list so its your call.
What MB you get depends on what you plan to do as far as OC'ing or stuff like that. I really like my K7T266 Pro now that the resitor issue is fixed and the BIOS has fixed a lot of other problems. It is very stable for me. It allows you to overclock if thats your fancy but I do not.