I too sail formula, but my next board was a HiFly 105 move. I wanted something to fill the gap and I chose an '08 iS 111. While I love the 111, I am not 100% sure it was the best choice, but it does fit in well with my sail quiver. I weigh 79kg.
Do you have another board other than the formula? What sails do you have? What it your typical wind? It's hard to know which board to recommend unless we have a little more information. Sorry to say, but the 111 may have been your best option if you are trying to cover the broadest wind range. If you only sail in winds below 20 knots, then the 121 may be the answer.
My boards and sails for freeriding:
Formula 160 - 11.0, 9.2 and sometimes 8.4
iS 111 - 7.6, 6.6 and sometimes 8.4
HiFly 105 - 5.7, 5.0, 4.5
Tiga 263 - 4.5, 4.0
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.
Last edited by Ken; 19th December 2009 at 10:50 PM.