I'm with Barb44. I'd go for the treadle, but not at that price (although I'd probably go up to $75-$100 since it's in a parlor cabinet). I'd certainly pass on the Eldridge unless you're thinking about having it rewired.
I *love* to piece on my treadle machines. I tend to sew pretty slowly when I'm piecing, so a treadle suits me just fine.