There aren't a whole lot of choice with FW
The older ones (221) came in black and light tan, and the 222 Open arm version came in black. In the later production Singer came out with the white (or celery) version and a main difference is the foot pedal and cord are hard wired. I would agree that it's not made as robust as the earlier version. Don't confuse the older tan model with the newer white model.
Besides making sure you can plug it in where you live, you'll want to make sure it's got the bobbin case. For a while there was an aftermarket source, then it went away and I don't know if another has popped up.
Don't worry about attachments as it takes the same short shank attachments as all the other Singer short shank machines. Sellers will list attachments as "for featherweight" as if it took special ones (and they'll ask twice as much too). There are only a few that are specific to the FW and that is because they mount to the bed or use the needle plate. Those are specific to the FW. Two would be the attachment plate for the hemstitcher, and the darning plate.