Thats not a upgrade thats a new build with your old harddisk :)
Why do you want the cheapest motherboard? Don't go to cheap on the motherboard. Do you need a ATX or microATX board and are you gonna overclock? And how many sata do you prefer?
In my opinion, with that CPU you should get a GPU thats quite a bit better. you should never cheap out on the GPU. something like an AMD 7950 would over double the graphical performance.
and an SSD would be nice for you to have as boot drive, and a 60gb drive isnt very expensive I think.
I think you could pretty much pick any motherboard thats has a LGA1155 socket, a PCI-e slot and 2 ort more SATA connectors.
a link to a list of good suggestions IMO: http://pcpartpicker.com/parts/motherboard/#m=8,18,27&s=8&c=52&sort=a6