Hi Chuck,
and welcome to CPF!
Well, around here the standard answer to your question is just buy them all.:lolsign:
I would suggest the L2T/L1T first, because of its two stages. To the naked eye, the difference in brightness isn't what a lot of us prefer. Most of us would prefer to have a much dimmer low stage. However, you can mod the tailcap with a resistor of your choice to change the light to a 3 stage, and get the low brightness level you prefer. Without modification, the stock 2 stages are fine, and the low stage increases the runtime significantly. The L2P/L1P are also great lights, although mine have a much warmer tint than my L2T light. I'm not saying anything negative about the tint, only that its different. Both models are very bright. Expect to get more brightness from the double battery models, although there isn't much change in runtime.
The L0P which is smaller and handier uses a AAA battery, and isn't quite as bright as its bigger brothers. Its very bright nonetheless, and the runtime isn't as good as the bigger models either, but its incredibly useful.
The P1 uses a CR123A battery and is very bright and super small. The 123 battery configuration may not be what you're looking for, though, as 123s aren't as common in bum%$#@ Eygpt as AA and AAA batteries.
I have several different types of rechargeable Nimh batteries.
Powerizer 2000 mah AA
Tenergy 950 mah AAA
GE Sanyo 1600 mah AA
Sanyo 900 mah AAA
Duracell 2650 mah AA
Digital (Walmart and other retailers) 1000 mah AAA
Digital 2200 mah AA
Digital 2400 mah AA
Others......
The Powerizer batteries are a few years old now and still going strong. I have 2 dozen of them, so they are rotated.
The Tenergy AAA batteries are great and inexpensive.
The Sanyos are top quality and about as reliable as you can get, and they're made in Japan.
The Duracells are excellent and made in Japan too. An 8 pack can be had at Walmart for less than $16.
The Digital batteries are proving impressive, as I'm using them more than anything in my flashlights lately. I'm trying to kill them because they just can't be as good as they seem for what they cost. A 4 pack of 1000 mah AAAs is less than $5.
Rechargeable Lith-ion batteries don't have the same capacity as their Nimh counterparts, and supply more than 3 times the voltage, so you've gotta be careful that your device will support their use.
Ni-cad batteries are still useful, but don't have the capacity of Nimh. They're getting hard to find these days.
Although there are few around here that aren't impressed with the Fenix lights, there are thousands of us who love them. They're innovative, well made, and reliable. Whichever you choose, you can't go wrong. Good luck.
PS, there are other similarly designed lights you might consider. Ultrafire, Luxogen, Huntlight, Liteflux are all competitive with Fenix, and you may find them to your liking as well.