Will concur with BillK on the Q4, which I have used many years with various water and solvent based coatings. The Q4 can handle thick paints like latex, but has way too much air output for GlamourII and Timeless. If you use the full output pressure you will get lots of overspray in the air and lots of bounce-back. I think the smaller turbine you're looking at is a better choice in most ways except noise. I finally added a garden-hose "Y" connector at the output of my Q4 turbine, with the spraygun hose connected to one output, and a 25 foot long "soaker" hose connected to the other. The soaker hose has porous walls and dumps about 1/3 the total air output through the pores. It also acts as a sound muffler. There is a deafening shriek if I simply partially close the on-off valve on the "dump" output with no muffler attached.
So yes, I think you have a good pick there and it's what I would buy when I replace my ancient Q4. I have the same T70 spray gun you are looking at and can highly recommend it as an improvement on the previous 2 models. But that's not to say there might not be equally good choices for less money. A friend uses a cheaper Earlex turbine with equally good results, AFAIK she hasn't had any issues with it. With any well built spray system it's mostly a matter of learning its particular quirks. Unfortunately the first quirkless spray gun has yet to appear.
If the T70 has a notable flaw it might be that during reassembly after a full cleaning it is possible to get an internal leak if you tighten the aperture nozzle too tightly onto the fiddly disc it rests on. So go easy there. If you get it significantly too tight, you might need to replace the disc, which I had to do. In praise of solvent sprays...I use my gun almost every day and haven't had to open it up for cleaning in over a year. Don't try that with water based sprays. All I do is spray about 40ml of lacquer thinner after each use. So easy! The used thinner gets sprayed into a can and I give it to the ever-grateful fine furniture artist up the road when I get a few liters.
You will have the choice of either an underslung "pressure feed" cup or an overhead "gravity feed" cup. Since I'm using exclusively solvent spray the gravity cup is the best choice for me because solvent sprays are essentially self-cleaning and keep the narrow passages open automatically. Because the total surface area exposed to paint is smaller with the gravity cups, clean up is much less hassle than with my old pressure feed cup. But since water based sprays gum up so easily, the wider passages in the pressure feed cup might be the best choice for Timeless. Since I have never used the gravity cup with water based sprays I defer to the opinions of those who have. FWIW the Fuji "gravity feed" guns introduce air pressure into the cup through an air hose, so "gravity" really only refers to position.
PS, initially set up your gun needle so it sprays water at about 150 to 200 ml per minute into a bottle. That's a good starting point for water based sprays is you move the gun about 1 foot (300mm) per second over the print about 8 inches (200mm) away. Don't drift away...8 inches should be your max or the spray will get gummy before it lands. Be sure you're getting coats that look wet for at least a few seconds after landing on the print, otherwise you will be coating your prints with gummy, partially dried powder. Oh, and the difference between actual temperature and dew point should be at least 10 degrees F.
