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Dunk. Tellurex has a very good technical page which explains all sorts of TEC stuff. You will find that stacked TECs is a science of its own - suggest a read.
Of all the components, choosing a heat sink is probably the most important, as Glen has pointed out. It will make or break the performance of the TEC.
For a 60 watt TEC use a 120watt heatsink, minimum. Rule of thumb double the power rating of the TEC. Another good check is to measure the temperature of the heatsink exhaust. If it's 10C or less than ambient with the TEC running flat out, you've chosen well - indicating that the thermal resistance of the heatsink is in the ball park.
No need to mention preparation of the copper surfaces and heat grease. Every junction presents a thermal resistance which needs to be minimized.
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