I've been getting asked a lot about stat balancing during or after raids by other powertechs / vanguards (I have both). The primary tool I use for my PT / VG is a spreadsheet originally by Morning Masume, later revised by someone else (forgot who) around 1.2, and that I have personally been modifying to keep current.
This spreadsheet us up to date with the latest release and includes a nifty new feature that analyses relic choices at the bottom of the spreadsheet.
Some functionality has been lost, mainly the sweetspot analysis that was present in the original, I hope to add that back into it soon. Also I haven't touched the DPS and Threat calculations present on other pages of this spreadsheet, so don't expect any reasonable amount of accuracy in those pages.
So here's a link to spreadsheet (Google Docs)
If there are any questions, comments, concerns, or corrections please feel free to contact me either on the forums or in game on the Harbinger on the toon Redtoo (republic).
Note: for the other tank classes I use a wonderful program by Dhariq which can be found at this link.
Thanks a bunch and enjoy!
Note: Yes I know there are no tanking changes on the table for 1.6, but the most recent spreadsheets I've found outside my personally edited one is only good out to 1.2, before the changes to the tanking tree that reduced overall shield rating and added the absorb buff.