probably the best performance upgrade I'd suggest for your money rather than bars would be tires, but it's your money and if you don't like the bars, put it there. Whatever makes you happy and more likely to ride and all that...
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"