HDs produce little heat a pair of 40mm fans will normally keep them cool, many of us however don't like fans hence the need to water cool. Since the heat is minimal the best way to cool is whatever will fit into your system the best.
The drives I have have flat sides. Since the drive chasis is made from aluminum it acts as both chasis and heatsink. With a 1" x 5" interface between WB and HD there is plenty of space for ~20W to transfer.
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CPU: Barton2500 @ 2.43 ghz
MB: NF7S Rev2
RAM: 2x 256mb Kingston HyperX 3500
HD's: 2x 160gb SATA RAID
GPU: Sapphire X800Pro VIVO -> XT Plat(softmod) 520/590
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