Is this the motherboard in question http://www.newegg.com/Product/ImageGallery.aspx?CurImage=13-130-226-S03&ISList=13-130-226-S01,13-130-226-S02,13-130-226-S03,13-130-226-S04,13-130-226-S05&S7ImageFlag=1&Item=N82E16813130226&Depa=0&WaterMark=1&Description=MSI%20X58%20Pro-E%20LGA%201366%20Intel%20X58%20ATX%20Intel%20Motherboard ; if so, I don't see the concern over not having enough PCI-E lanes for your current setup (dual gtx 470s, fatality x-fi champion).
You should still have no problem installing a TV tuner in the last PCI slot (far right side)
I just got a new pc. However; the pro-e doe not have enough pci lanes. I have dual gtx 470s with the Gulftown 980x. cpu. I have the top fatality x-fi champion series but I have no room for it. also; I would like tv tuner card. Anyone have any experience with this setup? Thanks in advance. Nofret