You'll need to know the wattage if you are to meet the minimal requirements of any video card. At this point I can not recommend any of the video cards until you determine the wattage of your Power Supply and the number of PCIe 6+2 pin connectors it has.
The 750ti does not need an auxiliary PCIe connector but all the other video cards we discussed do need at least a 6 pin, some need the 6+2 pin.