I'm running a 580watt PSU on my set up... 680i, GTX, water cooling, 11 fans, 3HDDs, two DVD Burners... and that's with output ratings of +3.3V@30A, +5V@36A, +12V1@20A, +12V2@18A, -12V@0.8A, +5VSB@2.5A.. So overall a combined Amperage of 38... But I still think that PSU will be fine for him @ 29A.
Not too mention everything is overclocked to h*ll... A lot of people over do it ion the power supply....