The Paasche VL is a venerable tool in its own right (slightly related - I've still got my old Paasche H and use it for big coats every so often) - but the Iwata HP-CS is worlds ahead of it.
I've used several airbrushes over the past few years, and to be honest, I keep coming back to the HP-CS and my HP-C+. They spray very well, clean very well (now that I'm using mostly Gunze lacquers, I'm finding that I don't even have to strip-clean the airbrushes after every session), parts are easy to find, and you can swap needles and nozzles (my HP-C+ is running a 0.2mm needle, and the Eclipse a 0.5mm out of the BR I believe).
I tried the Grex Tritium - it's a very nice airbrush, but the trigger design didn't agree with me at all and I found myself getting terrible hand cramps. I've considered picking up, what is it, the Genesis? Their standard-layout double-action. IMO the Grex cleans up a lot easier than the Iwata just due to the design of the paint cup.
I tried the Badger Patriot and Renegade Velocity and found them both crude next to the Iwatas, so I sold them.
The Harder & Steenbecks (I've got an Evolution Silverline and an Infinity) are very nice, very German-precise. Using one feels like rowing through gears on a fine German sports car. But I've found that they're prone to spitting, which neither Iwata ever does, and for close-in work where I need to put paint in a specific place (like, say, mottling camo), I've found I can work a lot faster with the Iwata since I don't have to pull it off the kit every time I want to press the trigger.
My two cents, though. I know people who swear by all of the above, even the Badgers that I didn't like. Very subjective thing, airbrushes...