Ditto. Anything between 70-75" is nice for 'round here.
Personally, I'd sell the tubies and get a good set of clinchers. Between the potholes, frost-heaves and broken glass on the side of the road (for the next month anyway) I can see changing flats being a pain. Then again, I've never ridden tubulars on the street.
Maybe keep a set for weekend trips to Bromont.