When I was taking lessons (short lived, as the instructor is about 2 hours away, and I have a very full schedule) he recommended a Gibson Poly, long. I've seen this one recommended elsewhere as well. I bought mine here. Keep in mind that it is it's own instrument, and pipers use them their whole lives. I wouldn't be too set on something low priced (although the Gibson I used and linked is only $15 more than your limit), but that's just MY two cents. The best advice as to the chanter of choice would be, as is often said, to ask your instructor what they'd prefer you use.