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Main said..
Ill be kitesurfing on a surfboard if over 18knots
Not for long

10 knots is ambitious. 15 knots and above fine to start with on the 1600. Once you get better you will lower that.
Waves, above waist high, and the 2400 are problematic. So if you want to ride bigger waves stay on the 1600 or get the 1850 which is a quantum leap forward for winging. 5.5 plus 1850 will get you up in close to 10 knots with good pumping technique.
Oh and get the 850 mast too.