Thanks for the input everyone and for doing some searching for me. That Seiko looks great, it's about 2 hours from me so I'll have to wait until next weekend to go take a look. Looks like a side load bobbin, right?
This may be a stupid question since I'm somewhat new to the world of sewing machines (I've used my 31-15 for years now but haven't really looked at other machines until recently), but if the two machines are branded differently but are the `same' machine, are they literally the SAME machine? The 206RB seems popular enough that I imagine servicing/getting parts for it should be fairly easy so the same should go for the Seiko, right?
Thanks again, super helpful.