RE: Replacing a 105L Hyper
Well, I would include the iS101 in my category of 100-110L boards. Barely, but it's in there.
Even though you are wanting SPEED, where the 94 probably outdoes the 101, it won't do that in marginal conditions. So even though you're limiting your wind range a bit, I'd STILL go for the bigger of the two (i.e., the 101). The main reason is that, statistically, you're more likely to have marginal wind that powered-up wind. So I would spend my money where the odds are greater. If you don't, the only valid reason in my view would be to go for maximum speed.
Best of luck!