A common theme in fabrication is the necessity of creating job specific tools. I'm often asked by other builders and hobbyists what tig equipment I use for welding titanium to insure the highest quality welds possible.
For a number of years I used a champagne cup from Weld Tech, but over the last year have transitioned to a custom cup configuration that allows better control of the argon coverage, greater electrode extension for those hard to reach places, and is less expensive to fabricate than purchasing ti specific equipment.
Here's a quick pictorial on creating the custom ti cup from available components...
Grab yourself a number 12 ceramic cup, large gas lens, and some JB weld...
If you want to check out a more in depth explanation with a demonstration, check out the vid on You Tube: http://www.youtube.com/watch?v=oPZ00jFDuxY