Since you like Wilco, you can't leave out I'm Trying To Break Your Heart, that's the most powerful love song of all time. Check out these songs:

Neutral Milk Hotel - In An Aeroplane Over The Sea
Elliot Smith - Everything Reminds me of her
David Garza - Float Away
Apples In Stereo - Lucky Charm
Sonic Youth - Do You Believe In Rapture?
Of Montreal - Don't Ask Me To Explain
Sunny Day Real Estate - Song About An Angel
Sunset Rubdown - Stadiums and Shrines II