I don't recall seeing a sayno charger that charges in pairs, I hear the sanyo are decent but somewhat slower chargers. The c401 has a fast setting which is almost too fast, it does make some heat, but I use it as my travel charger, figure if were out someplace and take a lot of pictures i can pop the spares in the 401 and recharge in and be ready to go again.
Some of the maha 80x series do c and d. You will notice that most c and d that are inexpensive have the same capacity of an AA, got find one in a store and read the fine print. True C and D size are around $20 each. You'll even find a lot of alkaline C and D which are just big AA's.
There are some fancy D adapters out there which will let you parallel 2 or 3 AA's for 4000 or 6000mAh capacity.
I switched to eneloops in Jan of 2007 so I've just finished three years with them. Have some 1600mAh Sanyos from 1999 that still get use in kid toys.