now that IS a can of worms!!!!
Probably for a standard portable you would be best served by a 2-jet model with 1.5" tubing and a 12" wide head, a good all-rounder. I don't think your machine pump is a high pressure model, so a 4-jet wand wouldn't suit it so well.
10" wide wand will concentrate the suction more if the vac power isn't so great, and the same applies in reverse with a wider model.
tube size - unless you're using a high airflow system such as the triple vac portables or a truckmount, stick to 1.5" tubing. Bigger tubing will decrease velocity which will actually make recovery worse