We used to have an Arban, not sure who has it now, but long tones are probably the way to go for now.
Thank you all you've all done very well.
You can download it free as a pdf here. You forgot to mention your pièce de resistance - but perhaps that is just as well. Jim probably wouldn't understand it! http://imslp.org/wiki/Method_for_the_Cornet_(Arban,_Jean-Baptiste)