GT - The FR 35 is a good watch overall. Its main shortcoming is that it sometimes takes too long to link up to the satellite signal. Also, I have heard that watches with GLONASS capability are more accurate, and the 235 has this capability.
Regarding running routes...I am more of less in the same boat as Smoove and Allen. I run the same 4 or 5 routes, and I make my daily choices based upon distance, hills, and boredom. In order to break up the monotony, I will run entire routes or sections of a route in reverse. I sometimes add segments, depending upon how I feel on that day. My main in-town route is the flattest, and I tend to stick with that one in hot weather. I tend to save my hilliest route for my Saturday long run, though I will hit portions of the route during the week.