Danger Den sell a 4x6" Hayden-style stacked plate rad that is less than 2" thick with two 80x25mm fans zip-tied to it. I've got one keeping a T-Bird 1400 at 49C (with a 250gph pump and OCWC polyblock), so it should be more than enough to cool your gpu and hdd.
[49C (ambient 29C) might not be that cool, but it's so quiet the sound of air movement in the apartment a/c is louder!]
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