Found this on the web based on the serial # prefix-
Sears source #s for sewing machines:
117=White (Also 2 models from Gritzner-Kayser in Germany that White imported for Sears.
120=New Process Gear Corporation. (A division of Chrysler when these were made in the 1950s.
148=Soryu in Japan
158=Maruzen in Japan (later Jaguar)
385=Janome
Maybe you can still find a Kenmore made by Janome through the dealer? I don't know anything about current plastic machines.
I have an older Brother CS6000i which I like for fancy stitches, but it's a bit touchy about linty thread. All my other machines are vintage Kenmores or assorted treadles.