You say "earliest planing possible". If you really mean this, why not the 141 or 155? One board won't offer planing at 10 knots and a "bit of top end" in 20 knot chop. The Formula experience may come closest to doing everything you want, but it is certainly a different type of sailing experience than a Futura.
I think you need something at can handle a least a 9.0-9.5 sail, but this size sail will work better with the 141 or 155.
Why carbon? Stiffer and rougher ride than the wood. I doubt the weight difference will be noticed, but the smoother ride will.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.