Coot, congrats for the motions grading! Really cool. That's really one of your strenghs.
About stab-tracker, the most accurate I've been using so far is the one from Autodesk. Really really precise and put to shame everything else I've been seeing. It's legendary, and you might have some similar feedback, But it's not cheap, if you're on Mac it would simply mean a Smoke software.
Have a look at Boujou 5 too.
There is a powerfull tool in Avid but it looked complex and complete but so far I'm still using the Autodesk Combustion one because I didn't had the time to dig into Avid.
On a budget, there is a good solution but it requires practice, but much much better than having to stab and therefore crop. Check that:
http://www.steadytracker.net/steadytracker/steadytracker-xtreme.htmlThe
extreme is not easy to manouver (will require lot of practise, I've seen footage done by experienced users with it and it's really good) BUT it allows you to zoom and follow focus. I've ordered one from CobraCrane.
Avoid having to stab in softwares as much as you can.
If you are going to use a camcorder with AF lens(es)
AND do not focus manually, and on a budget, check this company:
http://www.steadigo.com/it's more accurate than the U3X wich is not bad but you have best stab with this one.