I agree, but also make sure there is a PCIe 16x slot available. Diablo 3 1200p
At 1200p, the HD4000 gets 11 FPS, while the 7750 gets 50. The HD4000 is much better than the HD2500, so, if you want to have high detail, then definitely get a 7750.
Be sure to get the GDDR5 version. On Newegg US, it is a $10 price difference, and is worth it at higher resolutions.