as the title said the majors all use crap low power supplys
so you need to up grade to add a good vidio card or extra HDs
and poor M/B without many extra slots
btw there is a new M/B made to have a error free vannila boot mac build [hachintosh]
[just get osx- what ever and load]
this M/B uses mac friendly nic and sound chips and other stuff so it just works without alot of fooling around
will not ship intil may 13 but worth the wait if you want a mac tower for cheap
and you can dual or 3rd boot win or linix too