blue water length question

[peter.bomberg]

Ok, I have to admit I need help on this one, I am looking to get a Cat that can safely and comfortably cross the ocean, I have been told over and over look at 40+ feet the threshold so I have been looking at 4-50ft as the basis. However I am reading more and more people performing the crossing in a 35ft Cat, and the price delta is huge with a 35ft Cat in my budget and a 50ft requiring some serious thought, so please help with advice and knowledge.

For repeated Ocean Crossings (home base is in Bonaire, I know not a bad place to call home) but intended destinations include Australia and Asia (tech diver going re breather soon), what is the minimum length you suggest?

Current short list is the Spirited 480 or Waterline 1480