I just got an Epox 7KXA and i have had a lot of headaches. First of all i could not use my older(i say older but its pretty new) PC100 128meg stick of RAM. Second, for some reason when I put my DVD Decoder card in the first PCI it will not post with my memory and it just stops dead in its tracks. Third, my Aureal Vortex no longer worked worth a damn. I would get corruptions in the sound quality and it would eventually shut itself off.
I just got a new sound card (SB Live! Platinum) and so far so good but I am in the process of getting the newest drivers for it. The system is still very fast compared to my oc'ed celeron 400. Do some research is all i can say. Make sure all your hardware is gonna work before you upgrade.