actually, the PSU's in the branded comps are in the same class as the "cheap" smpses.. I've been through a few and for the most part they are tailored to provide only as much power as the system requires... no headroom for upgrades
Also Microsoft hardware is, in my opinion, good value for money, I have been using microsoft peripherals for a long time (currently comfort curve 2k, basic optical mouse, sidewinder 3d pro(ancient)) and I do find that they are more comfortable and last longer than their closest competitor in the Indian market.. logitech, for example... the mouse wheel on the logitech mice get spoilt very quickly... and also the lettering on the keyboards get rubbed out.. all my friends with logitech hardware are suffering from these probs... (the WSAD keys are wiped clean
and the scroll wheels have become loose and spin randomly, the friend who bought a mx 510 cannot adjust precision anymore b'coz one of the buttons is no longer working) we do abuse our keyboards and mice quite a lot and the MS products seem to hold up well under the abuse... if I am paying 900 odd rupees for a keyboard... I'd expect the lettering to last at least a year or two ( not that having the lettering makes any difference
).... and the same goes for the mice...