That Reg/Rec will work, I have a TrailTech Reg/Rec that I am using now. looks and feels more durable than the Ricky Stator unit. You don't HAVE to get a higher output Lighting Coil, but it is recommended.
On my Zilla I am using RS 130W lighting coils(2 on zillas), TrailTech Reg/Rec(available from RockyMountainATV good price), and a Yuasa Gel-Cell battery