I'd avoid using rechargeable RCR123(3.7v) batteries on high in any single CR123 light unless its for short term emergency situations because these lights will get very hot in a hurry and run times will be poor. If you really need a 500-770 lumen light for typical indoor electrical work(which I doubt), you should get a 2 CR123 light that also uses 18650 rechargeables, but they will be too large for pockets and will require holster use.
On the bright side, you really don't need 550-770 lumens to do standard electrical work. Any good quality, newish single Cr123 light should provide between 200-280 lumens on high/turbo with a CR123 battery, which can be had for cheap at the top online battery sites. You should be able to get Titanium Innovations brand CR123 batts for $1 each and they are very good, and get good ratings here.
As far as the real question, it would be best to get a light that is consistently easy and convenient to use. In other words, one that easily switches onto the setting you want without being complicated or having a switch that can be tricky to get to consistently switch to medium when you need it to without needing to be repeatedly clicked back and forth(as the Zebralight switch is prone to do). I actually use a ZL SC52 AA light, which is as bright as most CR123 lights while using one AA battery, but the switch must be clicked at just the right speed or it won't go to medium on the first try. There is no memory with the ZL switch style(UI).
Someone recommended the SWM V11r and that type of UI might be a good choice, also if you want a good but relatively inexpensive light that is super simple to use every time, I still recommend the Jetbeam BC10. It's a rear clicky light that runs on a CR123 and has 2 useful modes, 30L and 270L. It's 30L mode is bright enough for 95% of your needs, it's built solidly and only costs around $35 or so. I have owned one for nearly 2 years and carried it every day for over a year. It's a bit of a thrower, so it will have a tight hot spot and medium sized spill beam. It's beam on high will light up objects at quite a distance.
