If you are intrigued by a mid, get a used, old, classic one first. I got a mint Yonex r-22 for US$5 on e**y, and it is fantastic. Old-skool weight and balance (hefty but head light) and feel (solid but flexible). I found another one (as well as a pair of r-27s, which my trainer friends say are also fantastic) for slightly higher, and would have gotten it as my regular sticks. However, I also got a beat-up POG OS at the same time for the same price and loved it even more. So I ended up with a pair of new OSs instead.
I will look at what the bay has to offer, as well as the used section here on TW