Cheers to your upgrade and new adventure in DIY
Bad news: I believe it will be worth your $ to replace your RAM to 8 GB x 2 sticks and add an SSD for your boot drive. These two items will allow you to fully reap the benefits of the new CPU and newer technology.
Good news: depending on your gaming habits, you might not need a GPU just yet. Check out these links and decide for yourself...Intel HD 4000 (on-board graphics on the 3570K CPU)ATI Mobility Radeon HD 4670
I know - I linked a laptop graphics card, but if you read the summary, it's slightly slower than the desktop model. Main point is, if I am reading the two links correctly, the HD 4000 graphics on your new CPU will outperform your old card. Perhaps you can use the integrated graphics and see how you feel about it before purchasing a new GPU for now?
But allow me to step back for a minute and ask a few questions again:
- Gaming habits
- Complete specs of current build
- What do you want to do
The more information you supply, the better information you will receive. That said, you ask about the Gigabyte GA-Z77X-UD5H motherboard to pair with an Intel Core i5-3570K. Are you able to purchase in-store at Micro Center? If so, that's a good option to go with at about $320 (on a side note, if you are able to purchase parts online without sales tax, total price differences might be slim). But if you are looking to save, the $50 off combo at Micro Center applies to all Z77 mobos in September woohoo. The UD5H is regularly priced at about $180, which is not a budget-oriented mobo.
I will offer this build and you can take it with a grain of salt:http://pcpartpicker.com/p/hoK1
Micro Center has the ASRock Pro3 mobo I indicated as well, so the combo price with CPU there would be $235. ASRock is arguably lower on the name brand list of mobos compared to Gigabyte, but they are still solid. Micro Center has lots of mobos, so you can always find a different one, too.
The Samsung RAM is fantastic.
The SSD is a value model from Plextor, which is one of the top 3 brands for SSDs right now.
I believe your current PSU will be adequate for your new build, and I guess you have the other parts necessary (kb, mouse, monitor, OS, etc).
Research and ponder and let us know what you decide