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Howard
All the 144 BCD cranks are comparatively stiff. Differences are really in the bottom bracket and its interface. Up until a few years ago most frames were not really stiff enough to make any difference. Oversized outboard bottom brackets are indeed stiffer. They allow for both a large oversized axle-- which can be made lighter-- and properly dimensioned bearings but their support is, however, comprimised-- whence the call to the BB30 standard. The DuraAce 7710 uses an oversized axle (increases stiffness) but undersized bearings. The old square taper standard (Sugino75, Campa Pista, Miche) has a smaller axle but nice well dimensioned bearings. At the highest levels of competition one sees a lot of Shimano 7710, some Sugino75 and Campa Pista and and some SRAM. It seems in the US the Omniums are much more common than on the European continent-- where they are quite rare while Campa is much more frequently seen. Of the the lot I think the Campa Pista is probably the better value. The Campa BB is very good and the crankset is priced (in Europe) much lower than Sugino or DuraAce-- even sometimes cheaper than SRAM: ~200 EURO including a chainring. The 7710 is typically ~300 EURO without a chainring and the Sugino 75 is in between (but again without chainring and does not even include dustcaps anymore). All these three, I think, look and perform well. The Sugino75 looks a bit more "old school"-- like the last Super Record cranks. Any of these are good choices-- and none is a wrong choice.
If you don't want to spend that much the Andel Racing cranks are not that bad (note they are available in both 130 and 144 BCD)-- just not that nice looking. I'd not suggest the Miche since its not that cheap (~150 EURO) and its finish is not in the same class as Campa (for 50 EUROs more a better finish, excellent chainrings and a Campa logo). An attractive bargain option is perhaps the Stronglight 2000 cranks that Planet-X are selling for £50 (with chainring).