The Xtar VP-1.
Great charger, digital output so you can see your battery's exact voltage, smart charge algorithm, and settings for charge rate .25 amp for my 18350s, .50 amp for my 18490s, and 1 amp for my 18650s.
I love this charger. It takes all sizes with no fuss.
Very safe, too. If you leave your batteries on it, it will charge them to 4.2, stop charging, let them drain to 4.18 and take them back up. I have watched this cycle so now I know I can trust it.