OK, I am biased because I sell Hyperion, but I do like the EOS5i AC/DC charger. It is what I use and I like it because I don't need a power supply and it is very easy to use. We also carry the Bantam BC6, which also has the AC/DC feature, but has an integrated balancer. It is more expensive than the Hyperion, but with Hyperion you still need the balancer, so they are very close in price considering that fact.
Chris
Quiet RC Flying
www.quiet********.com