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Awalkspoiled said..
I'm 100kg and ride the 155 but often feel that the 145 would have been better in every respect except the ability to carry really big sails. One of the more skilled riders, around 85kg, at our local spot on Tampa Bay rides the 125, with either the Starboard 800 wing/115+ fuse, or with an ever racier F4. I don't think you can go wrong with either board, but do feel that the 1400 is going to feel very big pretty soon. I really liked it, but I'm a lot heavier. Very fast and extremely smooth to rise up, but there's definitely a top speed.
Agreed. I was about that weight (73kg) when I began and about 1100 is plenty big. Also, as others have said, extra float isn't a bad thing starting out, especially if your target wind range is 10-20kts. Board size as wind picks up isn't nearly as important as it is with regular boards. Volume is as much a function of the width you want and how wide the tail is for going upwind vs more freestyle/freeride oriented sailing.
If you are sailing in a true 10 kts. 125 l. will be easier than something smaller and give you some cushion when the wind gets light and allow you to use a slightly bigger sail.