Have you read Hush, hush by Becca Fitzpatrick? It's more about fallen angels then it is just angels but it works right? Anyhoo it's really good, if you haven't read it you should give it a try. ^^
Hush hush by becca Fitzpatrick, halo by Alexandra adornetto, fallen by Lauren kate, a little bit of angel stuff is in city of bones (mortal instruments series) ok that's about it