I have a 2hp Jet, it's more than adequate for my needs. Keep in mind that a DC by itself won't be much use on a table saw without extra measures (which I've never taken). It works well for most other uses, especially jointing, planing and thickness sanding.
If I were out in the shop every day, I'd probably do more. I'd buy an overhead air cleaner before I'd buy the micron bags. YMMV.