I have a Used AMD 7970 Graphics card for sale, no longer need it. This card is still very capable for today's games and would be a decent upgrade for someone on a budget.
the specs can be found here:
http://www.gigabyte.com/products/product-page.aspx?pid=4367#ov
Works find with Windows 7, 8, and 10.
The card is overclockable but had never been done by myself.
Price is open to reasonable offers.