Cause you never mentioned budget. A very important factor on this forum.
On the Cheap:
For $20 or so, maybe try out a MiniMag AAA. Pretty sure you can add a Tailcap switch too.
I like the Lumintop AAA. It has a nice beam.
Double the budget & double the fun!
Peak Eiger Ultra QTC AAA. It can run on standard Alkaleaks or 10440 cells. 10440's will give you 3.7 volts vs the average 1.5 volts from a regular alkaline AAA.
Now for a different school of thought.
If you like the AAA due to size and want power, search up BLF X5 XPL-HI. It is what I would call AA forum factor. It runs on a 14500 cell. Like I mentioned above, these are 3.7 volt cells, unlike a 1.5 volt alkaline. This light throws very well. Great for brief illumination.
So to sum a few things up if I went way over board:
10440 are rechargeable and the same size as a AAA cell. They are unprotected and typically put out 3.7 volts. A light running one of these on high can only run short bursts and the battery will not last as long as a regular AAA.
The 14500 is the same as above but in a AA size.
Also know, there are some normal AAA lights like a Streamlight single AAA that can run a 10440. They will typically put out a good bit more light and usually it's ok for short brief blasts. However, Use at your own risk. Also, you can't stick two 10440's in a light that holds two AAA's. The voltage will fry stuff instantly.
Sorry if I went way out there. lol