motor help

[Alf r]

Hello im in the proses of upgrading my genesis, and now i ned some help (advises) :)*!**

what i got so far, uppgarded to dual pickup/offset rudder/3/16" strut and driveline,
Turnigy Marine 180A BEC*!**


Now i ned some help whith what Engine i shud go for ,leopard 4074 --- 4082 what Kv ?*!**
i mostly run on 4s.. but like to try 6s laiter :) ... and be on the safe side :)

prop advise also :)

Regards*!**
Alf-R