Very similar setup to mine,
all you have to decide is weather to run the C300 on the Marvel or the ICH10R !
still not sure if a recent bios update has boosted the Marvell's performance, currently I have 2 C300s on the ICH10R and run 3 x Hanns-G HG 281s in 2D surround 6200 x 1200.
asked the question earlier on this page but no reply as yet.