no you only have to read the reviews about the 290Xs to realise how good they are....read them for yourself, nobody here gives a damn if you need a 1000 watt PSU, instead of an 800Watt.
actually what ive read is that the 290x are hot and required proper cooling solutions before they were usable...
"nobody gives a damn if you need bigger psu" ? well they should..
anyone who wants a build for a set budget should understand that due to the inefficiency of AMD gpus and cpus you will need to spend more on PSU, cooling and electricity
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this means the whole "buying for performance for your ££" is completely negated and shows a complete lack of what is actually seeing further than 2min in front of your faces...