hi there,
i strongly recommend a larger board for wakeboarding purposes because you do not have kite support for pop; your wakeboard could be approx 2inch/6 cm longer than your kiteboard; behind the boat a wakeboard is to flat because you also want some upwind performance; wakeboards are also wider because you need boots for serious moves...also safety is important; i would not do inverts with straps because i need to protect my knees from injury
if you like kiteboards with flex your wakeboard should also have some flex- because then the feeling is very similar and they are much more dampening jumps and are more forgiving during surface moves or hard landings; also on kickers and sliders much more control... i have a lf watson hybrid 143 and a lf element 136, they are perfect size for me (105kg; 180cm)- if you are around 80kg go for 133(straps)/138
here i ride the watson on cable during a competition:
http://www.youtube.com/watch?v=K6ndBuCXxsUregards
alex