I am looking for a slight upgrade - only MoBo + CPU but my GPU is also old so I think to go with a CPU with integrated GPU. I don't think to overclock at any time so the K-series are out of my research. It looks like I5-2500 GPU is slightly better than I5-3570 but I'm not sure which combo perform better. After all I5-3570 is the newer one. I have only two major demands - good performance when I use Microsoft Visual Studio (2010/2012) and I'm also a Civillization fan so I would like to go with the combo more suited for Civilization V. I am restricted by the money so for now I only plan to upgrade MoBo and CPU, no external GPU at the moment.