Still a few things to consider.
Bookmark this page for your Mobo > http://www.gigabyte....=GA-890GPA-UD3H
Note that there are 3 revisions for this board, not sure what the diference between them is. You will have to contact Newegg so that they can tell you what rev. they are selling as it is written on the box but not shown on the webpage.
Ram. Your selected ram has a faster latency, (timeing) so I think a better buy. On your Mobo page, click on the rev. you are buying, click on downloads, click on memory support list. follow the instrucions to save to your desktop. If the ram you have selected is on the page (pay attention to the timeing) you can be sure it has been tested and passed. If not on the list, it could still work but has not been tested.
Ram. You may already be aware of this, If your OS is 32bit it can only see and use about 3.??? of installed 4GB, so installing 8GB is pointless If the OS is 64bit your board can support up to 16GB.
OS. You have XP. 32bit or 64bit? If an OEM package, you will not be able to instal on your new build. Let me know.
We should than look at the HDD options.