This question has probably been asked numerous times before, but I'ma go ahead and ask again.

I'm building a system for "friend" of mine, composed of the following components:
Asus P5B DLX Wifi
Intel E6400
PowerColor X1950XTX
Corsair Twin2X P6400 C5
2x Samsung Spinpoint 250GB
NEC DVD-burner

I have found a case, the Antec TX1050B-EC, which also comes with a 500W psu (which I'm also wondering is any good). I don't know whether this comes with a 8pin power connector or not, but if it didn't, would that matter?