I got a faceplate and fixed steady with my S7, have used each precisely once in over 10 years. Buy when & if you need them.
4J and DTI essential, also a good tailstock drill chuck.
Make or buy a couple of boring bars.
Digital caliper and/or micrometer(s) – I often use both on the same thing!
Then you're pretty well set to do most jobs.
Headstock collets are nice to have when you need them.