Yep, you're good, 3.6v/cell is max for a123s and from there it depends on how accurate your charger is and how it does terminating the charge. Use it a few times and if it holds up, its fine.

If you're going to need to do 2 batts at once routinely - DUO II would be hard to beat. If you don't need the 2 at once capability, look at the Hyperion0610iNet or 0720iNet chargers. They're basically one half of a DUO with a little more output power. I charge my a123s at 10amps and even the 6S pacs are no probs. The 0610i does not have a real discharge capability - the 0720i does, thge 0720 can charge at 20amps (same output power limit though, 250watts), which may be handy if lipos start going 2C and up for charge rates - 0610i is limited to 10amps.

Charger selection depends on what you need/want to do and if you have plans that would require a new charger at some later point.