The only downside to 32s over 28s is that many (though not all) models get noticeably stiffer and heavier going to the wider size. If you get a tire that doesn't have such a "feature" you probably won't notice the difference. Something like the Continental GP 5000 or Compass Stampede Pass come to mind as light, flexible models. Still have 1,500 miles on my Contis to tell if they wear as well as heavier Gatorskins...