No master card needed for 4850 crossfire?

The last time I did xfire was with the X1800 series and I know that needed a master card. Can I just buy another Visiontek 4850 and then connect my other with that bridge? And can I still connect my lcd monitor with the HDMI cable? Can my Corsiar HX620 handle it? It has two Raptor X's, on sata blu-ray drive, and a couple of fans connected to it right now.

No. They can both be used as "master" cards.

ur psu is fine.
u can blend any brand and even 4870/4850 with each other in crossfire.

so just buy the card u like