Take a look at the Castle Creations Phoenix Ice 75. It has a switching bec that will work all the way up to 8s. And whether you go with two 3s packs or one 6s pack is up to you, but the charger you listed is only a 50watt charger and will only charge a 6s pack at about 2.25amps. So it will be a little slow. For your packs, if you go with the recommended 3200mah packs, then 20c will probably be okay. But if you go smaller, then you will probably need at least 25c packs. [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=9503&Product_Name=Turnig y_3300mAh_6S_30C_Lipo_Pack]Here's[/link] what I'd get.