Well there's a series right now that I really love. Its very AU, focusing on a more angelic plotline through seasons 5 and 6. Its got an OC that you get very attached to. Its got whump and romance and suspense. Its very good.
Little Girl Lost
is the first of 4 stories. ( story 2, 3,
) 4 not complete and is being updated regularly.
is a good one that features Cas, Dean and Sam whump.
Waxing and Waning
is a Dean whump fic. Dean's dying and Sam is rushing to find a cure.
is a really sweet oneshot.