I agree with Chris. I love Titanium innovations CR123's. They even sell them shrink wrapped in sets of two or three, for your flashlights. You should never mix lithium batteries, so this is a perfect solution. I also like Rayovac because they are built in the same factory as Surefire. And you can get a box of 100 for $115 shipped. Never buy 123's from B&M stores. You'll pay $2.50 and up each.
For rechargeables, I only will use AW...period.
The ITP is a great light. I have the upgraded Q5 light. I don't use it much, but it puts out over 160 lumens when I use an IMR 10440 LiIon. You will amaze and astound your friends when you show them how much light can come out of a AAA light. Roughly 5X more light than a 4D cell MAG light.
More than the ITP, I like the Maratac AAA a little better. Same LED, same amazing output with the IMR 10440, but it comes in black anodized, natural ano, stainless steel, polished stainless, and pure copper. They all look rather sweet. I always carry two Maratacs with my Leatherman, and two spare 10440's for backup juice.
I know a little about the Sunwayman too, and the M10R is a great light. That company is doing some really cool things right now. I expect to see more from them, as well as copycats, too. My favorite Sunwayman is the V10R in Titanium. A little pricey at $150, but it's a (R)CR 123 light that you can buy a Titanium AA extension for. It's claim to fame is that it has a fantastic ring around the head of the light that you can adjust the brightness. It's a very robust mechanism and is very solid. One light with the ability to switch between 123 and AA batteries can come in very handy. If you were lucky enough, a guy at CPF made 18650 and 18500 bodies for it too. In addition, he also made a replacement tailcap switch in titanium and sold it for only $45 or so. It has 3 tritium vials in it and will glow for at least 15 years. Enjoy.....