I own a 6268, which currently resides in my basement, but still works perfectly. It has a specialty embroidery attachment (which was really state-of-the-art at the time, back in the 80's), so it does actually do some embroidery, using cartridges (I have a couple of them). It was Singer's top-of-the-line when I purchased it.
I've seen them sell on eBay for a wide variety of prices, from $250 on down. Most people consider it a crappy machine, but mine never gave me too many problems. I did have to get the motherboard replaced once upon a time.