an x48 motherboard, there is so many different ones, personally i like the foxconn blackops motherboard, but thats ddr3 only, if you wanted ddr2 support
I use an EVGA that supports your video cards and personally i love the mobo because it performs well, but to answer you question, if you want a Intel brand motherboard you could go with something of these:
your video cards and personally i love the mobo because it performs well, but to answer you question, if you want a Intel brand motherboard you could go with something of these: