I second the suggestions for Shop-Vac. I have had several over the years. They do wear out or break, but no tears when they have to be replaced. Accesssories and supplies are available all over the place, so no trips to specialty stores to get things.
(We also have an Oreck upright and a small Oreck we use in the house and we like them a lot, but I wouldn't use either one of them in a shop. I will say I think they are a well-designed product and parts seem to be available, but a special trip to a specialty store to get them.)
--ShopShoe