Looking to buy my first new equipment

Question
QUESTION: Hi Patrick, I've been windsurfing 7 times so far this year, at 10 I get to buy myself new equipment. I currently am sailing an f2 comet long board, 67 cm, 170L 315cm long. I just am able to use the harness and managed to do one waterstart with a 6.0 sail. Typical conditions are a lake with anywhere between 10-25 knots. Most people here seem to ride formula with giant sails and I am more interested in freestyle and smaller boards. I am thinking about a freeride board like a starboard carve or a starboard go. Then after that a dedicated freestyle board. My sails would be a 5 6.5 and 7.5.

What suggestions do you have for board size/brand?

ANSWER: I need to know your weight to give you a better idea of what volume would be good for you.

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QUESTION: 165, I tried to include everything and forgot the most important fact.

Answer
I think you would be happy on a 125 to 135 liter board.  I really can't recommend a brand but Starboard has an excellent reputation. Volume at this point is more important than board style.  If you can, try to rent some equipment locally or attend some demo sessions and try to ride some boards in the volume range I suggest. Don't ignore the chance to take a lesson or two also if they are available in your area.    Your sail sizes look good, I would adjust it slightly like 7.5, 6 to 6.2 and 5.0.  I weigh 145 and the sail I use most here in the northeast on open bays is my 6.7 Sailworks race sail which I use on my 125 liter and 140 liter boards. I do feel very partial toward Sailworks and would recommend their Retro line of sails.
Good Luck and Good Wind
Patrick