I'm looking at a config by a reseller who builds custom machines. They have a machine with an OEM branded power supply for just under $2200. They offer a $75 upgrade for an Antec True Power 2.0 500W power supply. What do poeple on here think of that option on a computer of this grade? Is that a good power supply by a good vendor? Is it fitting for a computer in that price range? Opinions appreciated.