I use 35s (going down to 32s) on my 6mi each way commute. I'm also rocking Schwalbe Marathon Plus which apparently are virtually impervious to flats. I couldn't find them in 35, hence the downsizing. I don't see why you wouldn't go with something durable.

I check my pressures at least sunday night but also always test by hand before I ride, assuming I don't top em off midweek.