get a nvidia 260 or 280 GPU to save on upgrades when you go SLI.
Also you might wanna look at RAID the hard drives, as opposed to getting one big slow drive.
Proteusbr unfortunately i dont know much about it myself, im just aware of the benefits. I would hate to give out bad advice so i suggest asking in the HDD forums, theres some really clever chaps over that way that can advise you much better than me
for about the same price as the ps3 you can build a pc system using a budget dual core (which you can overclock to about 3ghz+) and use a ati 4850. this will be about 3 - 5 times more powerful than the ps3 in gaming
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