I have never seen the diablo mk3 before (or any reviews about it)
If you like the design of the flashlight you post in #1: Ultrafire 502 $10,99 with an XM-L with 600 Lumen
I like thsi design more, because it couldn’t roll on the floor: Ultrafire 504 $12,99 with an XM-L with 600 Lumen
The same charger as on amazon for $4,39:
Batteries:
I would take this Solarforce V3, 2600mAh, $14,50 a pair + $2 shipping
or for example this $6,89 each MarsFire/Sanyo 2600mAh
http://www.ebay.com/itm/New-Sanyo-Li-ion-18650-Rechargable-3-7V-2-6Ah-2600mAh-Battery-with-Protected-/350549576054?pt=US_Rechargeable_Batteries&hash=item519e620976
Here is a small review to both (old4570 wrote them).
MarsFire/Sanyo 2600mAh - Manafont do not offer tehm at the moment
Solarforce