I'm showing the specs on a 4100 SCR as:
Weight (dry): 18,800 lbs
LOA: 43' 7"
Anchor Sizing Guide | RocnaŽ Anchors
Spade: 44 lbs
Manson Supreme: 35lb
I'm not a fan of the Danforth anchor. I prefer the new generation anchors, which I've had much better success with. I've used the Rocna Traditional, Manson Supreme and Rocna Vulcan extensively. All with excellent results. I've dragged several times on a Danforth design.
I'd be looking at either a Rocna Vulcan or a Spade. I don't think the rollbar of a Rocna Traditional or a Manson Supreme will work with your through-pulpit anchor pulpit. I personally think the Manson Boss is ugly. I'd go with a galvanized anchor, along with 40 feet of galvanized 5/16" G4 chain and 5/8" anchor line.
This is just one mans opinion.