thanks for the replies guys,

I'm thinking I don't want something really expensive. So probaly nothing more than 1,000. However, I don't want something that will die or fall apart fast. Right now without any assist I can maintain an average of 10mph for about 40 miles. Otherwise speed really isn't to big of a factor, my biggest worry is battery life. I'd like to be able to go quite aways with the battery. If the battery goes dead during a ride, is it that much harder to pedal?