reviewing our options, want to understand if there are any single contractors who focus on Arbortext/Windchill specifically?
Are you looking to bring someone into your organization; ie, are you looking to hire someone?
If yes, would you please post more details here: PTC Community Networking Group
It's unclear exactly what you're after, but just in case you weren't aware, there are a number of PTC partners who specialise in Arbortext/Windchill for manufacturing and non-manufacturing clients. Our company GPSL (www.gpsl.co) is one of these, and PTC maintains a complete list on their web site.
As the others mentioned it might be beneficial for you to expound a little on your needs or requirements.
However, Gareth's company GPSL is very capable and I have known Gareth for quite awhile and they are experienced in Arbortext and PTC products.
We use Oberon Technologies as a system integrator and developer for our Arbortext Windchill system. They also set up the system and worked with us as partners to design a flexible approach to support our Military and commercial manufacturing activities. We continue to use them on various projects and would recommend them highly.