I think you're going to get a pile of different opinions on company and boat. But probably some consensus regarding age of boat.

Moorings is always viewed as the "safe" choice. But imho, there are other choices that are just as solid and likely better value. If it was my money and I was looking for a cat of the size you are seeking that was near new I would take a close look at TMM and CYOA. Both have new or near new boats in the size/age you are looking and both have a very good reputation here on this board. I'm biased towards CYOA for many reasons one of which is location which translates into cheaper flight to STT, avoiding the ferry hassle, and being on your boat half hour after landing.