I commute with 622mm (700C) x 47mm tires and very much like the smooth, comfortable ride. I use Schwalbe Marathons (Not Plus) and they cost about $30 each but are well worth it due to reliability (No Roadside Flats in 11 years) and long wear. I was not happy with Michelin brand city tires in the same size I used while in Europe.

I recommend spending the extra bucks and getting the Schwalbe Marathons.