I have used a Devilbiss advanced HD and whilst its a nice gun (i know its an industrial gun) its certainly not worth 3x the fast mover. In fact there is not much difference.
I used to spray boiler and pane!s in a factory using Devilbiss and Binks equipment and I use a fast mover gun and Sealey S701G and don't have any problem getting a decent finish at home. Infinity is a big claim there and a novice painter is going to notice very little difference.
I started spraying a year ago and all the kit cost about £1000 to be able to be able to do all the prep work and spray 2k safely. You need to think about much more than your first gun.
To be cost effective you need to be doing a fair number of jobs on your cars.
PS much of my kit as also bought second hand so the above is probably close to the lowest you will need to spend.
I've just got a hvlp gravity gun for 16 quid to paint the Landy using celly works spot on for what it cost I don't know if l would do much better with a 200 quid gun