The airbrushes jann's has are single action badgers. Nothing wrong with them if that's what you need...but it's not
First, you need to look for a double action, internal mix, and either side, gravity or suction fed brush.
The double action is controlled by the trigger, push down for amount of air, pull back for amount of paint. A single action is air only, the paint is controlled by a knob on the rear of the brush.
Internal mix is where the air and paint mix, in this case it's inside the brush, on the brush in the catalog, it's outside, you can see at the tip where it happens. The internal mixes it inside, channeling it all out at once.
My advice is to buy a name brand brush, and by name brand I mean Iwata, Badger, Vega, Thayer & Chandler, Paasche, Richpen, and a few others. Stay away, far, far away from the store brand brushes, and any brush that advertises itself as being like another brand, or equal to it, it's not. If it were equal to it, it would be one, and be able to stand on it's own branding. Aside from name brand, find a name brand brush you can buy locally. Most hobby or craft stores carry at least one of the brands above, and all offer % of coupons. Buy it local so you can get parts. Airbrush City will sell you a brush 'like' an Iwata, but you'll have an inferior brush that you can't ride up the street to get parts for, and you'll need the, at the wrong time, I promise!
As far as warranty, most brands offer a great warranty, Iwata offers a 5 year warranty, Badger offers a lifetime warranty, which also includes Thayer & Chandler and Vega, Paasche offers a year warranty, and I don't know the Richpen warranty. Keep in mind that Tamiya is an Iwata brand, and is often found in hobby shops as well.
Bottom line is if you're serious about painting baits, don't skimp here, or you'll never get any sort of decent result, you'll forever be frustrated, and eventually give up. Save up and spend the money, every brush I've listed is capable of producing fine baits, the rest is up to you