Pretty much friend got scammed by buying a 200$ pc with a non working 650ti. So he's left with an X4 860K, Asus A88XM-Plus motherboard, 4gb ram, corsair tx650 psu. I am looking for a card that would work great with his system. I tested the rest of the system out with my R9 380 4GB and it was working. We also planned to sell the computer and build a new pc with an i3-6100, but he doesn't exactly have the budget for that.
Any help is appreciated, thanks.
EDIT: His budget is 140€, so an gtx 750ti, rx 460, or an r7 370.