Join Date: Nov 2003
Location: Toronto, Ontario
Bikes: True North tourer (www.truenorthcycles.com), 2004; Miyata 1000, 1985
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If you want to be obsessive about it, google around. You will find plenty of rants on optimal crank lengths, historical data about the crank lengths preferred by winners of the Tour de France, formulas for determining the ideal crank length, and so on, ad nauseum.
Or you can just take Speedo's sage advise, or apply rwp's sensible rule-of-thumb, make your choice, and never give the subject another thought!