Which PSU do you plan on using? Do you plan on SLI or CrossFireX?
The 550 is a good card and all but the Radeon 6850 is the same price and good as well, didnt know if you perfer Nvidia over Radeon but since you were getting AMD i didnt know if you wanted to go ahead and go AMD on the card as well.
With a 550 W you'll be close to the edge. With one not very power hungry videocard it will definitely work if the PSU is of a quality, but you risk for example your computer to go down with every considerable variation in the electric current of the power grid. So - it will work, will it be good depends of the quality of the power grid in the area, where your computer is. More powerfull PSUs have more "inertia" + more room, so they are considerably more stabile on external current variations /this especially changes, along with the price, somewhere between 500 and 600W as the PSUs of up to 500-550 W are kind of considered to be a mainstream product while these with greater power are more enthusiastic oriented thus made with some extra quality in them, even if they are of the same type/.
I prefer Nvidia and no sli or crossfire and i was planning on using the built in power supply but if its not quite stable enough what Wattage of power supply would you recommend? And im not planning on playing any of the very high end games on highest quality settings i just want this computer as an entry level gamer so any upgrads other than the PSU and motherboard
Per the NCIX site, although the pic is of something different, your case comes with an Extreme Power Plus PSU; which is an overrated turd ( http://www.hardwaresecrets.com/article/Cooler-Master-eX... ). A quality modern PSU has full range active PFC (no little voltage switch), and some level of 80+ certification for efficiency. Seasonic, Antec, Corsair, XFX, and Enermax/LEPA are among the better brands.
Second, if you go with an AMD system, get an AM3+ motherboard, which can be upgraded to a Bulldozer CPU if that proves worthwhile. Also, most of the 900-series chipset boards support SLI (in case you want to add a second GTX550Ti), but the 800-series boards do not. Otherwise, your best sure bet would be to build an Intel Core-i5 system on a Z68 mobo.
Edit: As to wattage, a quality 550W PSU should be able to run any single GPU out there; 450W would be plenty for a single GTX550Ti.
"Edit: As to wattage, a quality 550W PSU should be able to run any single GPU out there; 450W would be plenty for a single GTX550Ti."
Just to add on this - a 450W active PSU of a quality will actually be any way better as a "550" W piece of garbage.
And although I am not a guy for the brands generally, about PSUs it actually matters - it may damage much more expensive components.
If you're building an AMD system, you should get a socket AM3+ motherboard to allow a potential upgrade to Bulldozer. Also, you'll want USB3.0.
I can't comment on the case since that is such a personal choice item.
The PSU will be fine.
Hmmm, that DOES have the black AM3+ socket, although the older chipset won't support some Bulldozer features (some dealing with power saving and related functions that may not mean anything to you, but also probably includes the turbo features).