Turnigy and Zippy lipos from Hobby King are a great value in my opinion. They also have several lipo chargers there that should suit your needs.

Make sure you educate yourself on lipo care and charging. Improper care and/or charging can lead to bad things. Don't let this scare you from lipos as it is not rocket science to use them safely but there is some diligence required.

Have you read through the Strike thread at all? I know there are some upgrades you will likely want to do to help with the reliability of the trucks.

Good luck.