For chargers, I'm looking at getting this model when I move to A123s:

http://www.giantcod.co.uk/dual-power-ch ... 04349.html

Mainly because it has a 240V mains plug so you don't require a separate power supply (not a fan of chargers that don't have mains plugs and require an external power source, just another piece of kit you have to buy/maintain/lug around)
As far as I am aware, it charges A123s (they're Li-Fe aren't they?) and has built-in balancing connections for up to six cells. Pretty low-cost too.