I think if you are looking into buying a bike, you shouldn't just consider gears. Which is probably the least important thing to worry about. Most bikes are SS now, so i guess go for it. In case you decide to change parts you might end purchasing more than planned.
To sort of sum up, don't just focus on gears. Look more globaly. Geo, brake set up, weight, whole look/style, only then gears i'd say.
Cheers, hope that helps.