If you have to deal with variable wind conditions and frequently get caught in winds less than 10 knots, having a board that can be uphauled is REALLY nice. The 122 may be the best bet if this is your situation, but having something like the 101 as your next board for the really windy days will cover just about everything you may encounter.
If you want to cover everything with only two boards, then the 111 would be your best choice.
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.