It is a strange one that by AMD to not allow the 9xx chipsets to be MATX
760g should be fine if not overclocking, and I think you can still get the 880 chipset boards.
Intel wise the i5 should be fine, I would check out a few benchmarks on modern games though, Watchdogs for example has a 8 core chip down as its recommended spec and a quad core as its minimum.