If you don't need it for an active war zone, then I'd go with PFlexPRo over Malkoff, if you value flexibility and options.
The mode switching takes a little adjustment if you're used to lights with secondary mode switches. With forward clicky, from off, you do half-presses until you get what you want. With reverse-clicky, you turn it all the way on, then do half-presses until you get what you want. The reverse-clicky is easier to change modes, but you obviously don't get the momentary capability. It took me about 2 days to get used to the forward-clicky, and now it's second nature.
One advantage to the Solarforce hosts is that it's easy to change the switch internals yourself. (It may be just as easy on the Convoys, but I don't have any personal experience.) If you ask nicely, Randy will probably send you a second set of modified switch internals and you can install whichever one you end up preferring.
The downside of the L2P/P60 format - and the only one, in my opinion - is that they're inherently inferior at dissipating heat. But PFlexPro does a great copper wrap, and with the thermal control you shouldn't have any issues. Mine all seem to shed heat quite nicely into the body. The L2P feels great in the hand, and there are lots of accessories available. Be warned, though, that many of the accessory tailcaps use different switch sizes, so you need to buy the tailcap you want from the get-go.
Randy's drivers max out at 4.2v, so there's no 2xCR123 option, sorry. You'll want a good 18650 - I use Orbtronic 3500 protected cells rated for 10A draw.
Spring for the microtextured lens. And I prefer the hybrid reflector - it's a great beam.