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Since you already will place big orders of parts... can you imagine to check out a passive cooling solution for the boards? So that in case a customer wants to go the easy way he can buy the cooling from you? I guess you would be in the best position to lower the prices through mass-order. I can imagine 4 cooling parts for 4 chips each... putting them on top of the chips or on the other side of the pcb when this is better.
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Sebastian - All good points! I just wanted to make a clarification about the heatsinks. These ASICs dissipate their heat from the under side of the ASIC.
Direct word from Avalon is that a heatsink should NOT be placed on the top of the ASIC (even with an under-mount heatsink). Has to do with the internal structure/air gap/some-such. This information is posted somewhere...I just dont have time to go hunting for it right now.