A charger with 50watts of output power is really all you need then. 50watt charger will charge 2S lipos with no probs. You can get 50watt chargers that are AC/DC so you don't need a separate power supply. Here's a good one that is in use here and has a good rep -

http://www.hobbypartz.com/thac6smbachw.html

This one is anothe rgood one that has a following here and a good rep. It has a few more features (USB link to PC) -

http://www.hobbypartz.com/skychb6chdup.html


The Venom is a fine charger, its a 50watt charger, but its a little pricey for what you get.