Need help making a mix CD for my girlfriend?

I've asked this question like 10 times already, but NOW I finally have songs. In rough order, they are:

01 You and Me (Plain White T's)

02 Must Have Done Something Right (Relient K)

03 Best of My Love (the Eagles)

04 First Day of My Life (Bright Eyes)

05 I Don't Do Crowds (Camera Obscura)

06 Out of My League (Stephen Speaks)

07 Your Guardian Angel (the Red Jumpsuit Apparatus)

08 I Will Follow You Into the Dark (Death Cab for Cutie)

The thing is, I need MORE songs for in between the more upbeat songs (Must've Done Something Right) and the slower acoustic songs (First Day of My Life), and possibly an ending song.

Any suggestions? Rock is preferable, or acoustic. No rap , hip hop, or R & B please.