How can you not keep Sano - he's one of the best 3b prospects with big time power. I'd take him over Arenado very quickly. The only thing I"m concerned about is if he moved from 3b but his power is unbelievable. I smell E5 Jr in him, honestly.
Agree with Ayebatter's selections, since you have so many prospects, can you maybe do some trading at season's end before keepers are due? Just wondering. That could seriously influence my selections.
Funny about Upton and Hamilton aye batter, I could see keeping Hamilton but BJ just well sucks.