Welcome to the board!!.....and go kick that LBS guy in the hinney!! J/K.....my "get back into biking by commuting" bike was a Trek Navigator 200 bought just about a year ago! She was my first Trek and my first bike after a 6 yr sabbatical and I love her! I rode my first 20+ ride on her and my first 30+ ride on her. I tried more to ride by time than miles at first and then once I realized I could ride the miles I just increased by half every time I wanted more miles.
So which Navigator did you get?? also, have you had a chance to bop over to the "getting to know you" thread?? .....if not, it's in the open threads and will give you a chance to meet us and - if so inclined - tell us some more about you!