Right now it's lowest at the top, highest at the bottom.

It is more natural for the top priority to be at the top and lowest at the bottom.
Also:
It would be really great if there were more than 3 priorities to choose from, like uTorrent's fine-grained priorities, or Vuze's numeric priorities.
Another thing from uTorrent and Vuze: it would be nice if when selecting multiple files, there would be an option to prioritize them automatically by their order. The first selected file gets highest priority, and each additional file gets a lower priority than the previous. This is really only useful if there are more priorities (like in my previous point).
This is similar to the existing "download in sequential order" but allows more control.
What do you think?