Final decision...?

Card
PSU
What differences am I going to see 'between the XFX GeForce 8600 GTS XXX, XFX GeForce 8600 GTS (regular edition?) and the eVGA 8600GT. Performance type of difference? Because the XFX 8600 GTS XXX edition is $20 more and just wondering if that would be better then just the regular XFX 8600GTS or the eVGA 8600GT?
PSU
What differences am I going to see 'between the XFX GeForce 8600 GTS XXX, XFX GeForce 8600 GTS (regular edition?) and the eVGA 8600GT. Performance type of difference? Because the XFX 8600 GTS XXX edition is $20 more and just wondering if that would be better then just the regular XFX 8600GTS or the eVGA 8600GT?