My home shop has a 10" Delta table saw with extension table (52") unifence and uniguard, a floor drill press, 3 benchtop grinders, 3 routers (Elu and milwaukee) 14" bandsaw and resawing blocks, 6" jointer, 13" thickness planer, european bench with 2 vises, 2 metal vises, a disk/belt sander, concrete polisher, shaper/router table, sliding compuound miter saw and a whole bunch of drills, jig saws, sanders, circular saws, 2 stage dust collector, a second ceiling-mount dust collector, several shop vacuums and a whole bunch of other stuff. Reason for mentioning is that, as of about 6 months ago, I figured that festool stuff was nice, but pricey, and I could survive with a reasonably well outfitted shop for a non-professional week-ender. Also, almost all of my tools are extremely well made in the U.S., not like the usual crap available today.
My adult son tried, and really liked, my barrel grip Milwaukee jig saw. Several months ago, I tried to find one for him to no avail, so I bought him the festool barrel grip; the closest thing I could find. He was new to power tools, and his first project involved cutting pressure treated 8 X 8's. The festool was absolutely amazing.
Since then, both he and I have bought festool stuff.
That as background. I am no pro, but I believe that the festool "system" is hard to beat. I think that the ets 150/3 (we both have one) is a great "bargain" and demonstrates, along with your festool vac, great design and really great dust extraction. I have several top-end sanders, some still new and in their boxes; they'll stay there.
I have the small MFT, my son has the larger one. using the TS55 with the MFT is a new way to think about ctting wood. It is no replacement for a table saw, but you've already got a great table saw. As said earlier by others, festool stuff complements what you have. Much like your domino. When I finally got used to my domino, it opened up a whole new way of looking at woodworking projects.
I would consider the TS saw and an mft table and one of the ets 150 sanders if I were you.