Why did you choose Amsteel?
Regarding boat size, one of my problems is berth size. Being 6'6" I chose my boat because of its bunk lengths not boat size. I think that the fun on a sailboat is inversely proportional to size.
Amsteel or Dyneema is stronger than steel yet it is light and flexible as any other 1/4 inch rope. Easy to work with, and easy to stow. Far easier to replace a broken stay or shroud with amsteel than wire and stronger too. The drawbacks are less resistance to chafe and UV.
I had a friend in Honolulu who dreamed of cruising someday. He had the same problem with headroom. Got an old wooden thing that sailed like the Mayflower and was nearly as old. He eventually wound up selling it and moving to North Dakota