I hate my 13-15-17-19-21-23 Regina America standard 6-speed and would not recommend it to anyone. It downshifts slowly, with ample chain clatter, and it is easy to make the chain skate over the tops of the teeth. A Regina with 3- or 4-tooth drops might not skate, but downshifts would be even slower than mine.
I generally like Shimanos and SunTours and have had good luck with a couple of SRAMs, including a 13-15-17-19-21-23-26 and a 13-14-15-17-19-21-23.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069