hi all after recieving my m18t pro today

im after a system for it.. im not 100% on the kv motor i should be using in this little beast so any help would be appreciated ive been offered a hobbywing 1/18 system (7600kv i think) and a dynamite 9200kv ...whats gonna be best for the nationals and everyday racing?? and what kind of kvs are you guys using??
cheers all!