Motherboard with Intel onboard graphics : Intel 915GVWB or GLDW, no PCI-E slot for upgrading graphics, both are MicroATX form factor
motherboard with onboard graphics & PCI-E slot, Intel 915GAG, MicroATX
Intel motherboard, cheap & best at stock, forget tweaking or overclocking
Asus motherboard is good, with onboard gfx but the PCI-E X16 slot is in reality working at PCI-E X4, which is same as AGP 8X speed, so don't install anything higher then a 6600 LE on it