Thanks Dave for clarifying what I meant.
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I thought max heatload would be relevant?. would thicker BP mean the fins overlapping the core by more than 2mm?(wider spread?). Is there a program like Radiate(I've not seen it yet) that shows you heat~spread but shows what H2o at various rates/speeds would remove as well?, to various shape/designs?. There should be! . Any thermal/fluid software you'd recomend?.
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Max heatload is relevant. Like I said, assuming around a real 100W maximum would be fine. I was referring to it not being relevant to specifically target a block for some range of heat loads. Just pick a maximum and run with that. Every heat load less than your targetted maximum will then be catered for. The block won't behave "erratically" just because you throw a lower heat load at it, which was the point I was trying to make.
I've been packing boxes all day in preparation for moving house, so I was probably being too nit-picky on that point. My apologies.
I wrote a thermal simulator myself which is how I basically decided where to go with all this. Aesik has also written one which is a more advanced model than mine, and Les uses a mix of different web-based applications and some back-of-the-envelope calculations to pull it all together.
My program allows you to play with the convectional coefficient of the coolant and the flow rate, but doesn't allow you to vary it for different sections of the block.