a) Adding it anywhere would be better than the current situation.
b) Feel free to reorganize the page to bring say ar up as well.
The only goal should be to make things easier for newcomers. I think it makes sense to highlight the active variants where the owner is around to answer questions.
@akkartik: I've been granted write privileges and have begun contributing to the wiki. I agree that some reorganization is necessary and have been taking a good look at the current state. I will focus on giving newbies some more hand holding at the getting started stages, and have opened a new Installing Arc page where I will be more elaborate in detailing installation instructions.
@pauan: I agree that Lite-Nu is the simplest in getting installed and started, and so will add Lite-Nu install instructions and references as well. Newbies should thus be attracted, deservedly, towards Lite-Nu especially in the initial stages. :) After that of course, it's up to them.