Welcome BackStage -> Personal opinion...get the ARC AAA first, easy to carry in pocket, around neck, on keychain...you'll never know it's there until you need it! The Ultra is good too! It has it's place in the "toolbox" due to longer runtime from the AA vs. the AAA. Get them both, they won't "break" you...compare them for yourself.
Get a Luxeon Star or one of the other LED drop-in mods for your MiniMag (they're affordable), you'll use it all the time on the job. Then after reading EVERYTHING (you've got a lot of time right? Ha!) here, upgrade, move on, look at other options and needs that other torches can provide.
Go to the links section (it's still there, eh?) and visit some of the review sites and do your research online...THEN GET OUT THE WALLET!!
Seriously you know all about tools that make your job easier and "are the right ones when they are there for you". Enjoy the information, reviews, experiences of others while being entertained at the same time!!