I agree with Nick's suggestions, but I would also urge you to get
a 5770 Video Card. This
XFX 5770 is only $3.00 more than the 5750 you have listed, and it will perform much better, especially for gaming. Also, XFX has double lifetime warranties on their products, so if something goes wrong with the card, you're covered, or if you decide to sell it, the person who buys it is covered 👍 Also, the 5770 will game much better at higher resolutions than the 5750. Even if gaming is not your main concern, it'll be a much better all around card.
Here are a couple of benchmarks that show the performance of the 5750 vs. 5770:
http://www.tomshardware.com/reviews/radeon-hd-5770,2446-7.html
http://www.tomshardware.com/reviews/radeon-hd-5770,2446-13.html
Here's the full article:
http://www.tomshardware.com/reviews/radeon-hd-5770,2446.html
Also, if you want to try it, you can usually unlock the other two cores on that processor to turn it into a quad core. Here is a youtube video that describes how to do it:
It's really not too complicated. You just change a couple of BIOS settings, and try to boot up. If everything's good, you just got yourself a quad core processor for $90. If not, you just change the settings back and use it as a dual core. The only downside is, if it works, you void the warranty, and you can no longer monitor your CPU temps as easily. That's just something to consider if you want to try it. Lot's of people buy this particular processor with the intention of unlocking the cores. Apparently the success rate is pretty high too, somewhere around 75%. I think that ASRock mobo has unleashing mode (or ACC, whichever mode you need to unlock the cores).
It's up to you though. It's a great processor even if you don't want to unlock the cores--especially for gaming.
Also, you can save $5.00 on the Windows 7 OS with this code on Newegg--EMCYNZN56--Just enter that at checkout, and it'll take $5.00 off the price.
But you have to select EggSaver 4-7 day as the shipping option to get the free shipping. Otherwise, if you use UPS 3 day shipping, it charges you $5.99 for shipping. Here is a link to NewEggs' email promotions:
http://promotions.newegg.com/NEemail/latest/index-landing.aspx They usually have a lot of good items with promo codes you can use to get some extra money off.
Also, while the case you've picked should be fine, if you want to overclock in the future, you might want to think about getting one of these other two Cooler Master cases:
RC-690 for $79+free shipping+$10.00 mail in rebate or the
Cooler Master Storm Scout for $89+free shipping. I know these are a little higher than the case you have selected, but it's $67.50 including shipping, and the RC-690 is only $12 more, and it comes with 2 extra fans for improved cooling, and it's a little bigger than the one you selected which means it will offer: better cable management, better cooling, more room for components, more room for future upgrades.
Also, these bigger cases will better accomodate aftermarket heatsinks for your processor if you want overclock it.
I'd recommend one of the following CPU coolers if you want to overclock (or if you unlock the cores on the 550):
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103064--This one is $19.99+free shipping, and will cool that CPU
well enough at stock speeds, with unlocked cores, or with a very mild overclock, but not much more.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065--This one is $29.99+$7.56 shipping, it's the Hyper 212 by Cooler Master,
and I use it on my core i5. It does a great job, and you can't beat it for the price. I have my i5 overclocked to 3.5ghz, and it keeps it idling between 32--37 celcius, and doesn't get higher than 63c under 100% load with prime 95.
But, it's HUGE, and it may be a tight fit, even in the RC-690 case, but it should fit. I have a Cooler Master Storm Sniper, and it fits, but there's only about .25 inch between it's edge and the side cooling fan.
This one
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134 would also be good, and it's a little bit smaller than the Hyper 212, so it should fit most cases no problem, but it's about $43 including shipping, and is not much better than the $20 one I linked above. But if you don't plan on overclocking that processor, you really don't have to get one of the coolers. But I would if you have the extra money, because both AMD and Intel's stock coolers are just garbage. But, you have to keep the original cooler that comes with the processor in case you have to RMA/return the processor for any reason. You have to include it with the processor when you return it, or they won't take it back.