I am thinking of picking up a new hobby - Kyosho Mini-Z RC Car

Anybody can advice me on Kyosho Mini-Z RC car?

eg:
MR-01 vs MR-015 vs MR-02 vs MR-03 vs MA-015 AWD ?
where is a good place to buy?
where can i race?
where to find community / gathering / etc ?
any good website resources to point me to?

Thanks in advance!