do you have a hobby shop in your area? consider what they stock for parts or if you have to order online consider pricing on shipping and turn around times.
Have a look through the build manuals for the kits and decide which one seems easier to read and understand and then beat up google which searches on that kit. The cheapest part of getting into this hobby is probably buying the car itself.
try googling-best rc rally car
I'm pretty sure you're going to find a big squid shootout among other relative results