You have plenty of keeper options. I wouldn't even worry about Butler/Blanks/et. al.
I would hold onto 3B David Wright, OF Justin Upton, C Matt Wieters, OF Jason Bay, P Yovani Gallardo, P Tommy Hanson, P Brandon Webb and OF Jay Bruce (not much trade value on those last two) for sure. (If I had to choose 4 more: Ludwick, ARam, Zobrist, Oswalt)
Use the rest of your guys (Ludwick, ARam, Zobrist, Oswalt, Nolasco, Soria, Francisco) to hammer out 2 or 3 solid keepers. Maybe overpay slightly for a Votto or Adrian Gonzalez... Turn your older starters into a younger one (Kershaw?)... Try to consolidate your 2 solid SS into 1 (Tulo?)... Send away your closers to competing teams.... Whatever floats your boat.
But after your fireworks, I would have no problems keeping Chris Davis as one of my last keepers. viewtopic.php?t=395850