Another Isonic or a Futura?

[Marc 1964]

I have sold my 2006 Isonic 105. I want something faster! That board was perfect to control for me, and gave some real fun to sail. But the top end speed disapointed me a bit. Now I want something realy faster in the same range (95-105 ltr.) I'm searching for a good controlable and a faster Isonic 2008/2009. The alternative is a Futura. Also the same litres and the same years. (2008/2009) I've heard that the Futura's are extremely good to control. But... How are the upwind capacities?

I mostly sail on flat water and bigger open waters with some chop or minimal waves. I use these widesleeve racing sails: 7.4 6.6 and 6.2 meters. My best fin's are Select SL7 fin's (33 and 37 cm.)

What Starboard should you suggest? A Futura or another and younger Isonic?
Is there a big difference between 2006/2007/2008 and 2009 Isonic's? Can i go much faster on a younger Isonic?