IMHO - based upon OP's brief info - suggest a cyclocross style bike with 1x9 [8 or 10] gearing. I know the SS/FG trend is popular in urban areas, there are times when a few gears are very nice - when there is a bad head wind or when the powerplant isn't feeling well or carrying an extra load [groceries or beverage]. IGH are nice - probably a trend of their own lately - I have two which work well and are great in traffic - but they are just not as "zippy" as the deraileur set up. The 1x9 set up is pragmatic and reliable for commuting, provides a good range of gears and easy to maintain. The cyclocross or similar bike accepts a wider range of tire sizes, 28-32 mm tires often provide a better ride and less subject to road abuse than 23-25 mm road bike tires. If you go with a road bike, suggest getting one with relaxed geometry vs. racing - easier in traffic and on your body parts & get a good fit.