I own a Stillwater, five UK's and five PK's.

It sounds like you're in a Traditional groove, so, of the companies you listed, I think you'll want to start with the Stillwater. I have a heavyweight, and I recommend it. (Also, please consider USA Kilts; I have 2, and the Philabeg is a really good choice as well.)

The UK is the most widely-recognized contemporary. Very good construction and design; a narrow apron in front is surprisingly practical (you'll know what I mean the first time you sit down). I hear they're using lighter materials these days -- I hope that's not true.

Once you've had some time in kilts, you know how they wear, and you know just what you want, it's time to go to PK's. Every kilt is a custom job, and, as Jeff will give you exactly what you ask for, it's important to know just what you want. PK's will give you anything you ask for at high quality (except tartan).

Congratulations on making the switch. You've taken your first steps toward being one of the sharpest-dressed men on the planet.