I have a trek 1000 road bike (from 2004) that I love. It was the lowest end from, as I was coming from mtn bikes and was not sure if I would spend much time on the road.
It does not have anything fancy, but it has a decent frame that can be upgraded as desired. It does not have a carbon fork stock either... I figure I will appreciate it more if I ever get one!
I run it with spd pedals on both my bikes, as I find those shoes better for commuting and errands.
I would look for one of the 1000 series on craigslist etc.
But get yourself sized properly for your bike. It is worth it.