I love my GLV2. I don't know how much you wanted to spend or if it is something you have to have right a way, but the mods from Greatlakesvapor are great.
Jay only does the CR123a batties ( 16340 ), that would be 2 batts for the full size and he puts in a resistor to get it down to 5V or 3.7V. I thought mine was a bit hot for what was supposed to be 3.7V so I took out the resistor and put in a single 14670 batty and it is perfect.
Long story short - I would recommend the GLV2 with no resistor and the 14670 batty. These mods come in a lot of colors and can be engraved.