Angie,

Have you chosen what bike you're going to buy? Wheel size will play a role in what kit might be best. Truthfully, although there are a few hub motors for 700c wheels, many merchants advise against them. If I were you, I'd make sure to stick with 26" wheels. I ride a lot of dirt and gravel roads in the forest here and there's no way I'd want skinny 700c wheels on my bike.

FYI, if you're interested in saving money, keep your eyes on ecoforumz. The administrator there is in the process of trying to organize a group buy for the Currie conversion kit. Although it doesn't come with LIFEPO4, you can add that after the fact. It will be interesting if he can better the lowest price on the web, which is $279 with free shipping.