As far as i'm aware its all standing so best available would just be general admission. It'll probably give you a seat number by default, mines something like 3000 something, but disregard it.
This is going to be great. I've not been to see them in Leicester before, as said before - tickets are often like gold dust. Also, the fact that there's going to be an event this size in Leicester, put on by massive city fans at a time when we could be cele- ... you get the point.