^^^ Those are the same pacs I'd recommend too. They might be a little more expensive than some others out there, but they will be better value for your money in giving you more run time and longer life.
A decent charger is something you just gotta have if you want to treat your batts right. You need a peak style charger so the batts are charged to max capacity every time. Onyx 200 AC/DC charger would be a good choice.
http://www3.towerhobbies.com/cgi-bin...&I=LXTCJ8&P=ML