What exactly ARE you looking for? The tk20 does 150 lumens with 2 AAs, and I consider that more useable light too, as I use mine outdoors, and to me, warm LEDs have a HUGE advantage over cool ones, plus it's almost half the price of that one.
If you want to go for multiple AA or AAAs, there's a huge market, but I ask why. AAAs don't have that good of power density relative to a AA, so sticking 4 of them in a light is just silly by my standards. If you had a price range, a use, or ANYTHING that let us know what limiting factor to look at, we could give suggestions or tell you good job on your purchase. E.G., best AA light, best 2xAA light, brightest AA or AAA light, most useable AA or AAA light. Or: I'm using this to walk my dog in/near the woods. I'm going to use this for bar tricks. I need a home defense shotgun light. This is the light I'm sticking in my pants/carrying with me all the time.
I'm not trying to berate, but just curious as to what you want, and also have a need to know what someone gets whenever they ask for advice on buying something.
Zero