Here is a picture of the cedars before the hurricane.

Limbed up metasequoia and/or taxodium, I'd leave a little more space than in the pic though. If you are zone 5 go with the taxodium. Leave enough room on the street end to plant a flowering tree of your choice on either side.

I worry about monocultures as the wrong winter or bug comes by and you have nothing, ask the gateway arch folks. But your drive was pretty darned neat looking I must admit.

A driveway lined with Katsura trees is really attractive!!

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Thank you both! We are looking for something the same size as the cedars about 40 ft at maturity. The trees you suggested are beautiful but I fear a tad big for our space. I love the idea of a flowering tree at the street.

Hovenia dulcis is a deciduous Tree growing to 10 m (32ft) by 7 m (23ft). It is hardy to zone 6 and is not frost tender. It is in flower in July, and the seeds ripen from Sep to October.
http://www.pfaf.org/user/plant.aspx?LatinName=Hovenia+dulcis

Here is a link that might be useful: Tree Recs

Check out fastigiate european hornbeam, since you're after a medium-sized tree and like the look of 'pears' (I'm guessing you referred to Bradford pear, which tend to have a more formal, smooth, full-bodied form).

I don't know how they do in your area, but if you like a medium-sized zone appropriate somewhat formal tree, just might be the ticket.

Richard.

Thank you so much! I think hornbeam might work.