I have owned several Gerber printers, and have run them off Flexi (8.1) and Omega. Flexi takes some time to setup but it was my first time using the software with the printer. Omega is a little better suited in a workflow sense.
I really like the Edge 2, prints at 600x300DPI, and durable like older versions. I never have owned an FX but have seen here and there that they can have more issues- they do have more internal moving parts.
Foils are aplenty on the used market for the Edge 1 (LE) and 2. I would not go trunnion ( opens from the side not front) due to its age.
Make sure you see a FULL Bock print test- to be sure that the unit is not missing any pixels. Also shipping is not easy - heads need to be strapped or secured, and in original box or similar. I have sold several edge printers, and have my own way of shipping.
Also I recommend you pick up a Gerber cutter - its the easiest and most efficient way to cut the decals. (Disclaimer- I have a edge GS15 Plus cutter for sale in classifieds)