Hi tecnoreaper, you're Foxconn 6100K8MB-RS motherboard can use a single PCI-E x16 graphics card. As seen in you're manual on pg. 4, motherboard layout. If you do not have you're manual you can download it from the link below.
http://www.foxconnchannel.com/EN-US/support/downloads.aspx?ProductModel=6100K8MB-RS&TypeID=en-gb0000001

After instaling you're PCI-E graphics card you will need to enter you're bios & set "Init Display First" setting to PCIE page 41 in you're manual.
Here are a few PCI-E x16 cards you may want to buy.
I do know that XFX GeForce cards do carry a Lifetime warranty.
http://www.tigerdirect.com/applications/category/category_slc.asp?CatId=1558&name=PCI-Express-Video-Cards
At the bottom of this link you can pick the total ammount of memory you prefer you're graphics card to have.
Foxconn suggest you use any one of these PCI-E cards.
http://www.foxconnchannel.com/product/GraphicCards/index.aspx
but you can choose what ever you wish.
Mai web site for you're 6100K8MB-RS board.
http://www.foxconnchannel.com/EN-US/product/Motherboards/detail_overview.aspx?ID=en-gb0000022

Enjoy!
If you need or have more questions, feel free to post them here.
Mike