I think any mATX board you see will have IGP, so look for the 945G and 965G chipsets. For some reason most motherboard manufacturers think that's what people want with mATX, integrated graphics and little-to-no overclocking.
There are some exceptions. Took a few years, but manufacturers eventually discovered that people buying AMD CPUs might... just might... be enthusiasts. Early on Foxconn made an Nforce4 chipset mATX board. Then, Jetway made an overclockable mATX board using the ATI IGP chipset. Following that, Biostar made the Tforce mATX board with the Geforce IGP chipset, then DFI finally made their appearance with a mATX ATI IGP chipset board. Finally, eVGA suprised everyone with a mATX SLI board. All these were for socket 939 except Biostar also made socket 754 versions. Oh yeah, somewhere along the line EPoX got into the game with a mATX Geforce IGP board that's overclockable.
More recently with socket AM2, EPoX, Biostar and... Abit have made their mark with overclockable mATX boards using the Geforce IGP. Indeed the Abit board (top end NF-M2 Nview model, not the other models) is as good an overclocker as any board. People have taken them to the 400MHz HTT cap.
Mentioning the P965 chipset makes me think that you're wanting an enthusiast/overclocker board. If not overclocking, then any of the IGP boards should work fine with a PCI-E video card.