>Acme is a little less feasible for me due to not having found a proper (3-button + trackball) mouse to use with it.

I use Evoluent at home and HP's 3-button mouse on the go (http://www8.hp.com/us/en/products/oas/product-detail.html?oi...): while Evoluent is more ergonomic, it's too bulky to be portable.