The rudder is only $34, so why wait?
The turbofin upgrade kit is $122.
If you have the money, I think you already know the answer.
If you are on a tight budget, get the turbofins first.
These should be standard equipment. Hobie likes their add-on sales so this is what we have to do to complete our kayaks.
Tacky marketing tricks, IMHO. This is how they pump the bill. Nobody EVER downgrades.
PS, anyone want to buy a small rudder? I have one available in perfect condition