Paasche has been around for over 100 years and, besdies the Talon, haven't changed their design much in that time (only once for the VL). I have a Paasche VL and Talon
TG airbrush and I love them both. The VL is over 30 years old and works just as well as it ever has... it's a real workhorse! Parts are more readily available and much less expensive than brands like Iwata (at least for US customers). If you ever have a problem, give their customer service a call and they will get you back up and running! I can't speak enough on the quality and service I've received from them.
As far as thinning paints I typically go with the "milk" bit but get there doing the following, depending on the paint and tips I'm using:
#1 Tip (.55mm or smaller) - 16-20PSI for details with the VL, Much less for the Talon. Low PSI and thinned paints = detail.
Normal
GW & Vallejo: Water: Windex: Paint = 5:5:1
Foundation Paints: Water: Windex: Paint: Medium = 10:10:1:1 (I find the higher pigment count needs to be thinned more)
Larger Tips halve the amount of Water & Windex and increase PSI to 20-25.
General Advise:
-Some people will tell you that amonia is bad for seals and stuff but the only seal on a Paasche is in the air valve, which you shouldn't be getting any paint in.
-Make sure to clean the airbrush out with distilled water and a drop of soap as the final wash after running windex to clean that stuff out and you'll have no problems. Or you can buy something branded as "airbrush cleaner" but I find acrylics are easy enough to clean with windex then a cup full of water with a drop of soap.
-Get some Airbrush Needle Lube and apply a VERY thin layer on your needle and inside the tip to help reduce clogging. I ran foundation white through my brush for 2+ hours painting 10+ minis last night and never once had to stop and clear a clog.
-Take a look at this guys site for some other basic tips.
https://sites.google.com/site/donsairbrushtips/home
Welcome to airbrushing, hope this helps!