sound to me like the isonic 111 is going to make your day! If you pick the 105 from 6.5 en higher, the isonic would fit with 6.5- 7.5- 8.4 en above that, you can use the F160.
For your conditions and gps - use, i'd go for the isonic.
But in order to understand you completely, why should you go for the futura 111??