I am in need of a new vacuum. What would you advise on looking at. My wallet does have limitations though. For right now I am probably looking a midline unit. Doesn't necessarily have to be a dual motor unit but is a plus. I am just not sure where or who to start with. I guess I should add that this will have to be an all around vacuum. One that is for commercial as well as residential. I really hate cross contaminating jobs with a vacuum but I also dont like sucking all that crud into my machine even though it runs through a pre-filter.