The best way to do that stackable staves: see the last two lines here: http://i.imgur.com/tqZRXzt.jpg

Ledger lines preserve the melodic contour but it's harder to read the notes. 8va's stay within the regular five lines you know how to read, but fragment the melodic curve. This way has the advantages of both the above and the disadvantage of neither.

(The lack of key sig in that image is a limitation of the software it was printed out from, I think; it should start in E and change around a bit afterwards. The "3"s are that software's way of printing tuplets.)