Well, we currently don't have the manpower needed to get started right away. And we have to face the reality that this project will take a hell of a lot of time, just to finish one mod, let alone the content of a whole modpack. For each mod we have to design, build and test a whole assault course, that covers each aspect of that particular mod.
In short, we can't just flip the switch an everything is done. But i understand your concern, but there is nothing we can do about it at the moment. Maybe if we have the manpower and 1.8 is still down the line, then we will start sooner.
Use what ever you like, or are the most familiar with. It's a requirement so we can see if you're able to build what we need. It doesn't have to be pretty, pretty comes later