I LOVE H&S!! hehe. They're simply beutiful peices of kit. (are the brand that Vallejo ship with their own airbrushing kits - its more to do with locale than anything else - Vallejo are European, so are H&S)
The Ultra is the entry level brush, I never actually used one, but they look solid.
The actual difference between that and a silverline Evolution is mostly the ptfe solvent resistance o-rings and seals in the silverline, and how you can upgrade the silverline with accessories such as cutaway handles, guidline stopper, handle extension, different sized paint cups etc.
I've just replaced my Evolution Silverline because I used an innapropriate cleaner some time ago and the chrome plating is worse for ware :( But I replaced it with an Evolution
CR Plus.

which is more of the same but slightly better again with triple chrome plating)
Theyve even just come out with an all aluminium body airbrush for light weight-ness.
I cant rate this manufacturer of airbrushes highly enough really. The build quality and design ingenuity is just wayy up there. Totally worth every penny they charge, would pay a good 50% more without complaint
tbh.
Edit; yes for you Americans.. spares might be tricky as this is a German company. But being German... its some of the best engineering around... No joke. The product really speaks for itself. If in
EU definitely consider these before looking to Badger or Iwata.
As for the 0.2 nozzle.... well my only response is to learn to thin paints matey. 0.2 sprays any citadel paint just fine. even the metallics. Once thinned appropriately ofcourse. Also had great success with Windsor and Newton Galleria, cheap craft shop paint, valljo paints, Liquitex Inks, Daler Rowney system 3 paints, Waterborne automotive paints, 2pack auto motive paints and candies, etc etc.. I've spray sooo many different types of paint through a 0.2mm nozzle. They all spray 100% totally fine! Even Vallejo Surface Primer does.
So I dont know what your problem is with 0.2mm? I suggest buying quality thinners. Vallejo airbrush thinner handles all acrylics that Ive tried so far well. So does Liquitex Airbrush Medium.
That said H&S offer 0.4mm and 0.6mm nozzle and needle setups too.