I'm here, I'm here! somewhat belatedly... Fab collection, all gorgeous. Though I don't know that I would call Jealous Guy a love song. More an "excuse for behaving badly, but it's ok, cos it just means I love you" song - but it is lovely.
OK, here's my selection - maybe not my favourite love songs, but the ones that sprang to mind.
Joe Cocker - You Are So Beautiful
Diana Ross - I Thought It Took a Little Time (But Today I Fell in Love)
Throwing in something you might not have heard - NZ musician Chris Knox - Not Given Lightly
This might be a bit obscure too - Cheryl Dilcher - Deep Down Inside