We can all make as many suggestions as you'd like, but we don't know what your taste is - a frend of mine had a Nick Cave song for her wedding song. Not everyone's cup of tea, but it was personal to both of them, it made them happy and that's what counts.
I think it has to be something that you that's special to both of you, not necessarily even a love song, maybe it's from film you both love, or that has lyrics that mean a lot to both of you.
It doesn't matter if it's been played at a million other weddings or if nobody's ever heard of it. It's a very personal thing.
But here are a few suggestions from me anyway:
Turn Me On - Norah Jones
Happy Together - The Turtles
How 'Bout Us - Champaign
Never Too Much - Luther Vandross
Maybe I'm Amazed - Carleen Anderson or The Beatles
Wondrous Place - Billy Fury
You're All I Need to Get By - Marvin Gaye & Tammi Tyrell