I'm soon to have five:
- Badger 150, internal mix dual action siphon fed (my first AB)
- Badger 100LG, internal mix dual action gravity fed (I actually will have two, one is a parts rig. I can't buy the individual parts for the price the garage sale offered!
- Badger 200-20, internal mix single action siphon fed
- Thayer & Chandler Omni 4000, internal mix dual action gravity fed
- No-name (sold in the US by Harbor Freight, external mix single action siphon fed which is a clone of the Badger 350.
The second 100LG and the Omni 4000 are on order from the garage sale.
The first 3 share parts, the 100 & 150 differ only in the means of paint delivery, the 200 shares the needle and head assembly of the 100/150 series, though it uses a different needle (only in length!) and air valve.
My main rig right now is the 100LG, though I suspect the Omni 4000 will replace it if what I hear is true.
The 200-20 is my "detail" brush, as I can dial in the line thickness, and the single action makes it very easy to maintain that thickness.
The 150 is mostly retired now, unless I need to do a lot of solid color painting.
The no-name I use for my flood Future clear coats, and is considered a disposable brush if it ever gives me trouble. I continue to use it as it is very simple to clean. The only reason I bought it was I got a vinyl hose and a couple of extra bottles with it when it was on sale for cheaper than a "proper" vinyl hose was selling for!
I've thought about getting a manifold and having all my brushes hooked up, but it only takes a moment to switcht the brushes and so haven't bothered.
I "could" use only one brush (the 100LG or Omni 4000) for all my painting needs, but I'm a tool hog. I'm sure I won't stop with only five!