I think there will probably be some jail time involved for posting something so "sappy" on the Internet...
But how can 'ya go wrong with
"You Light Up My Life" by Debbie Boone? The "feel good song of the '70s."
http://www.youtube.com/watch?v=wxo0lsJnx-U
The other one that comes to mind is "Don't Stop Believin' " By Journey.
http://www.youtube.com/watch?v=CNB1EUJg1-w
And for me personally, "Wheel in the Sky."