Well then, get whichever is cheaper. They're all good PSUs, and if you're not fussed about all the fancy bells and whistles then the only issue is price. Not the seasonic though, as they have been known not to play nicely with the DFI boards, not always but if you're not a noise freak then it's not worth the potential hastle of RMAing it.
A good 400W PSU could manage that by the way.