For the money you looking to spend I would go for a Hobbywing 120a V2.1
http://www.hobbywing.com/english/Art...?ArticleID=447
An Intellect Lipo - The high C rating the better - must be BRCA legal if your looking to do regionals.
B6 style charger - About £20-30
All the above from a popular auction site and from Hong Kong.
Re the motor I would see if you can get one second hand from the for sale section on here - popular winds for 4wd are 5.5 or a 6.5.