i think Atomic Kitten - Love doesnt have to hurt, would be very lovely choice:) it kinda describes Brennans feeling for Booth hehe:)
or maybe Roxette - A thing about you
posted over a year ago
and few others i just thought about, Kelly Clarkson - A moment like this, Jamie Cullum - Everlasting love, The Corrs - Irresistible, Duncan James - What are we waiting for....