Board size to rider weight

Question
Thanks for the info.  Very helpful.  I actually already know how to water start.  I have been to an ABK camp - ton of fun.  I do want to get additional lessons.  I am stuggling a bit with my jibe.  Where I sail most of the time is chop - .5 foot to 1 foot.  But, wind only 15-20 most of the time - sometimes 23-24.  Based on this additional info, your thoughts?  Still thinking a 100 liter board?  I have seen some xcite rides that looked fun - 95 liter and 105 liter.
Thanks,
DAn
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Followup To

Question -
I have sailed for 2 years on a 120 liter board using a 5.0 and 5.5 sail in winds ranging from 15-20 mph.  It has been great.  My greatest difficulty has been equipment selection - I weight 135 pounds.  Guys I sail with have 50 pounds on me, so they rig bigger sails and ride bigger boards - and cannot really provide a recommendation.  Your expertise would be very helpful if you could give your reccommendation on what size board a 135 pounder can ride that will not be a sinker.
Thanks,
Dan

Answer -
120 liters is a good size for your weight. I weight 145 and sail a 125 liter board in lite to moderate wind.  For your weight you could go down to maybe 100 liters and it won't sink completely but if you are uphauling you have to consider the water conditions, for 100 liters you will be in medium strength wind and the water will not really be flat enough to uphaul.  I sail a 85 liter board in medium to strong wind and I sail my wifes 70 liter board in strong to hurricane force winds.  The 85 liter board does not really sink and you can uphaul it in calm water but you won't really be sailing a 85 liter board in calm water so you should really learn to waterstart and you won't have to worry about sailing a non sinker.  Best place to learn waterstarting is in waist to shoulder deep water.  Start by learning to beach start, that is , holding your sail while in thigh deep water and learning to let the sail help pull you up on to your board.  You can then progress to slighty deeper water and keep practicing.  Get some lessons.  It will definitely help you.

Answer
I got it now. Don't worry about if it's a sinker if you can waterstart.  The only time you need to be concerned about sailing a sinker is if you can't waterstart.  So if you already have a 120 liter board I would go to an 85  liter board as your 2nd board so that it can handle from about 18mph all the way to about 30mph wind.

If the 120 liter board is not yours and you are looking to buy a new board then I would stay in the 100 liter range. You won't be able to sail anything below about 15to 16 mph winds though.
BTW I always check to see what used equiptment is for sale.  You can pick up some terrific stuff dirt cheap if you know where to look.  I buy all my sails and carbon masts and booms used.

I have a 140 liter, a 125 liter, a 85 liter, and a 70 liter board so I can sail in anything from about 10 mph wind up that I share with my wife.  
I have a 3.2, 4.5, 5.0, 5.6, 6.0, 6.6 and 7.0 meter sails that I also share with my wife.