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Well , you will most likely end up with the 0.8v - 4.2v pill ...  Since you will need this voltage range to run 2xAA or 3xAAA 

 Alkalines  2xAA

Low mode = 0.11A 

Medium mode = 0.44A 

High = 1A  

Varta 2xAA

0.14A

0.5A

1.15A

L2i 

3xAAA 

Rechargeable = 3.94v Total 

0.08A Low

0.36A Med

0.85A 

Dry Cells = 4.96v

0.07A Low

0.32A Medium

0.67A High 

Single AA 

Varta 

0.13A Low

0.67A Med

1.8A High 

The good thing about the L2i , its a battery host , 3xAAA , CR123A with adapter , 14500 , AA , 18500 , 18650 ...

I would not trade away my L2i , anything you can jerry rig to run in the body will power the light . 

All pills are 0.8v to 4.2v Solarforce 3 mode low voltage ...

I think the L2R is the way to go if you rely on standard AA cells, but for the runtime you need I would seriously consider switching to 18650's. You can get 2.5-3 hours on very high brightness levels and they are cheaper in the long run. Also the new R5 drop-ins blow the L2R away in light output, especially the side spill, but they are only available in LIION configuration.

But coming back to the L2R:

http://www.candlepowerforums.com/vb/showthread.php?t=246286  (extensive test, bit hard to read)

In a German forum someone wrote 80-90 min endurance on high before it gets visibly darker, with 5 sets of  batteries that would translate into 6-7 hours runtime. ( source in german and the crude translation )  I have the mentioned low voltage drop-in with 3 modes. If you intend to buy from ITC make sure they send you a drop-in with golden springs and a white emitter PCB, that one is considerably brighter than the ones with silver springs.

I have 2 L2R and I only use Eneloops and I think regulation is better than most budget lights in that price range.

The reflector shape  is more or less the same in all P60 drop-in I have seen. They are all designed to be more "throwy" than "floody" but a big difference is the emitter that is used, so an XP-G has more side spill than an XR-E. An orange peel reflector is also good for less cree-rings™  and more side spill.

More explanation here: http://www.candlepowerforums.com/vb/showthread.php?p=2992875

3rd option = L2M [ 18650 body ] + CR123A extension ...

Allows for / CR123A / 18650 / or 2xAA  ... I have several lights set up to run this way ..

Or a 9P [ 501C ] , these are 3xCR123A P60 host bodies , pop in a low voltage drop in , and run 2xAA [ I have this set up as a dedicated 2xAA ] 

Thank you all for advice!

 I'll be ordering the l2r , and maybe later the body of l2i. I allready have 18650 p60 host, but the reason for aa alkalines is the same old; they're cheap and you get them from everywhere. And they can easily be stored in fishing toolbox.

Good choice but I think you should at least upgrade to Eneloops, they are cheap now. Even brightness and regulation should be a bit better with them.

http://www.cpfmarketplace.com/mp/showthread.php?t=217531