I personally recommend the CMG Reactor...the cheapest Lux-Star flashlight in the market so far...Its really bright and the construction solid.
U are however limited to using Lit AAs batteries if U want the output to be at it brightest. Alkaline AAs could also be use, but the output would be less desirable. According to one flashlight evaluation website(sorri can't remember the website) If Lit AAs was used, the output would be consistently high till for 10hrs before it drop to the level of Alkaline AAs.
I compare the PT Impact & the Reactor using similar batts side-by-side and I dare say that the Reactor is slightly brighter, but the Reactor have a "further" reach.
If U can, take your time to choose a CMG Reactor properly as I have seen my frz's Reactor coming with a slight greenish tint...a QC problem from Lux-Star recently.
My 2 cents!!!