You have an ATX motherboard so make sure you get an ATX case. The GTX 560 is 9 inches in length so that shouldn't be an issue. Any of the ATX cases in your link should work. As for the power supply, a good budget one is the Corsair CX series. Honestly the lowest end 430W model should run what you have with no problem but I would try not to skimp on the power supply as much as possible.