you could go for a proper water loop, s.s.d.'s in Raid, another monitor or two, depends on your budget/worth ratio to be honest, I think thats fine as it is
I do find it interesting in your specs list, you say your chips overclocked to four MEGAHERTZ? or is it overclocked by 4Mhz?
surely thats a serious underclock or a tiny overclock hehe