Reddit reviews Airbrush Depot® Brand Airbrush Compressor AIR Regulator with Water-trap Filter, Now Included Is a (Free) How to Airbrush Training Book to Get You Started.

Unless you live in a desert-dry climate, you'll at least want to add a moisture trap like this. Having a fine control regulator (like the one included) is nice, too; you'll have much better control over airflow.

Something like this?

I'd imagine it would. You could use this regulator to get it down to 30psi to airbrush with using this regulator http://www.amazon.co.uk/gp/product/B00171BFKK/ref=as_li_tl?ie=UTF8&camp=1634&creative=19450&creativeASIN=B00171BFKK&linkCode=as2&tag=theplacrablo-21&linkId=B2UA7GBYXFXSCCFS

It's one I have attached to my compressor.

Badgers are great and I have a velocity and it's the best I've ever had (http://www.amazon.co.uk/gp/product/B0013NBQLA/ref=as_li_tl?ie=UTF8&camp=1634&creative=19450&creativeASIN=B0013NBQLA&linkCode=as2&tag=theplacrablo-21&linkId=JBYG4F6UTGNAA6PD), however it might be worth getting a cheaper one to learn with as they get broken easily because the needles and parts are so fine. So maybe pick one up like the iwata neo. That was my second one and the only reason I replace it was because I fucked it up in my ultrasonic cleaner by keeping part of it together.

http://www.amazon.co.uk/gp/product/B00792I04U/ref=as_li_tl?ie=UTF8&camp=1634&creative=19450&creativeASIN=B00792I04U&linkCode=as2&tag=theplacrablo-21&linkId=ODKBVSRHLROHJ7KI

Stepping down from the big compressor isn't that hard or expensive. I have this compressor, a quick disconnect at the tank, then run a line to my modelling station where I have a second regulator and water trap with quick disconnects. I set the "Tool" pressure regulator at the compressor to 50 or so so I dont have to fiddle with it to go between garage uses and airbrushing uses, and the regulator at the booth down at airbrushing pressure. I can go a couple painting sessions without having the compressor run, if not more.

I can provide photos later

Both is preferable. Doesn't hurt to double up. Either of which are relatively inexpensive. Depending on what compressor you are using, it is preferable to have a regulator that uses a 'closed' system rather than a 'bleed-through' system. The reg that comes with Iwata's SmartJet (like mine) uses a 'bleed-through' which meant that if you wanted lower than 40 PSI, the excess air was vented to get to the PSI you wanted so that meant that the compressor was constantly running even if you weren't actually spraying which could decrease your comps longevity. I've since replaced the reg with a closed system that contains all the air so now my comp shuts down once it reaches it's max PSI when not in active use.

http://www.amazon.com/gp/product/B00171BFKK?psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00
This is what I have currently installed.

As others have said. The only difference between an airbrush compressor and a shop compressor is the water trap and max output pressure.

You can buy a water trap for £15 in the uk. Prolly equiv in US. That also has a pressure control switch and a gauge to ensure you keep the pressure at the 20psi or below that is usually needed for an airbrush.

But the water trap is about the most important bit. Without that as the air expands into the hose water condensation will build up messing up your paint royally.

This is the trap that came with my airbrush specific compressor.

http://www.amazon.co.uk/gp/aw/d/B00171BFKK/ref=mp_s_a_1_1?qid=1453719845&sr=8-1&pi=SY200_QL40&keywords=water+trap+airbrush&dpPl=1&dpID=418p-7bshxL&ref=plSrch

If you're buy an Airbrush Compressor it should have it included along with a water trap. Should Look Something like this.

So, I have a smaller compressor at home for tools and the such, this guy
https://www.amazon.com/gp/product/B000N5UHK0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
and I have attached an airbrush regulator with filter
https://www.amazon.com/gp/product/B00171BFKK/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Will these work good for air assist? I rarely use the compressor and would love to make it more useful ;)

Can't you just add a secondary regulator downstream from the broken one? Then you can drop your 60 to 30 without worrying about the original.

That said, I have an older Badger and the regulator appears to do nothing until it is turned almost to the extreme end of its range-- sits at 80 psi until the last 1/2 turn, after which it drops right to where I need it.