4850 Purchase

I'm running a computer with:
MOBO - http://www.newegg.com/Product/Product.aspx?Item=N82E16813128081
CPU - http://www.newegg.com/Product/Product.aspx?Item=N82E16819103235
RAM - http://www.newegg.com/Product/Product.aspx?Item=N82E16820231098

My computer seems to be shorting out lately, and I think it HAS to be my video card, a 7800 GTX. I haven't had a chance to test it, but the three above items are brand new, and it only happens when I stress the video card with graphics.

So..
I'm looking at a 4850 to upgrade to. First, my computer can run it.. correct? Second, http://www.newegg.com/Product/Product.aspx?Item=N82E16814102770 is what I was looking at. If not, could anyone give me some recommendations?

Thanks!

what power supply are you currently using?

Also I would avoid that card as it uses a no referance pcb that looks like it is inferior to the reference one. It certainly has an inferior power delivery system. Basically these factors could hold back your overclock potential

550W, forget the brand.. Antec I THINK.

Well, OC doesn't matter to me so much as a nice sturdy GPU. One that'll run great and last awhile.

What about one of these two?

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102759
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127370

I would recommend a Visontek or Diamond. It is much nicer when working with reference.

That MSI is supposed to work pretty well. Otherwise just get a reference card from Visiontek or something.