Upgrade or New Desktop

I got impatient for a new desktop so went out and just bought one. I am playing RIFT and WoW but tired of always playing on low settings, which runs just fine for wow but on rift fps is quite low.
I have, nothing too great but this is what I've got now...
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02039571&lc=en&dlc=en&cc=us&product=4172648

and I would like to put in
psu: http://www.newegg.com/Product/Product.aspx?Item=N82E16817152035
video card : http://www.newegg.com/Product/Product.aspx?Item=N82E16814130573

I'm just not really sure if it would be stupid to buy these or if it would be better to get a actual gaming computer (which i should have done to begin with lol)
Thank you in advance for the help.

Reply 1 : Upgrade or New Desktop

...then I'll recommend getting something faster for gaming.. Yes, the RAM, and new power supply, and graphics card are fine, assuming the motherboard supports it all, but the E5400 is a 2.7 Ghz Core 2 Duo processor and you will probably find it a little lacking. It's fine for home and power users but a gaming machine could do better.

As just an example, our new Windows 7 Pro computers at the office, which perform basic office work, are using newer Core 2 duos with 3.0 or i3's with 3.2 Ghz.

Just my opinion though...

Hope this helps.

Grif