The Cannondale is not bad either, but I'd still try talking the seller down. It's got a race geometry, and if it has an aluminum fork, the ride is a bit choppy. Your old Schwinn road like a Cadillac...the Cannondale will ride like a Porsche, very quick but a bit harsh. So it may not be your cup of tea.

What are you looking for most? Comfort? Speed? Both? To be a parrot, you need to figure out your ideal frame size first. Then you need to think of what type of setup you want. If you end up wanting a taller stem to get you in a more upright position, that would look silly on the Cannondale (I know, I've done it!).

You might be better off looking for a mid 80s full touring rig, like the Miyata 1000 or 610, Trek 720 or lots of others to choose from there, Univega Gran Turismo, Centurion Pro Tour, Fuji America, etc. They'll give you a strong, yet still relatively lightweight frame, relaxed geometry for improved comfort, triple chainrings up front and wide range gearing out back, and lots of braze-ons for racks and fenders (perfect for a commuter).