That Peak Special CPF edition light is a great light. I have had a chance to play around with it. I don't think it is that much brighter than a modded Q3R so if you want to save the money, since you already have a Q3 you just need the batteries and charger to get pretty close to the Peak. The peak is a nice light though.
I think that most of the really good lights are very similar in brightness. They use similar reflectors and similar Tbin LEDs AND they use the same CR123A rechargable LiON battery so the difference is not that great when you start running Single LEDs with Single LiON batteries. It's the reflector that make the big difference then and that is more to shape the beam etc.
I like the Surefire L4 and the Aleph A19 (linked in my sigline) for a nice Big WALL of light. They can use a 5W LED and I think the L4 has 2 non rechargable CR123 batteries. I'm sure we can mod it here for you but it will start to really add up and will get well over the $100 mark
Just my 2c