Certified Bike Brat
Join Date: Jan 2011
Location: Montreal, Quebec
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Giant bikes in general are hard to beat for value. Of the three you've listed, all three have the same wheelsets and two have the same tires. The Giant City has the lowest grade of component selection (crankset, drivetrain, shifters, brakes, but is still a pretty good city bike.
The Roam has a front suspension that you really don't need in the city, and its not a great fork anyway. The Seek has identical components but slides in hydraulic brakes in place of the front suspension on the Roam. Long term, the Seek will offer more trouble-free driving miles with the least expense. It's the most expensive but delivers the most PRACTICAL value.
For a city commuter my choices would be the Seek first, the City second and the Roam last. Not that the Roam is a bad bike - but its a better choice for someone doing at least a little off-road.