The Python Micro Adjust ($120), Cobra's newest sight, is a good combination of technology and simplicity. At only 8 oz., this sight is lightweight, and the mounting bracket has two positions for considerable vertical adjustment. For windage and elevation, the microadjust tool-less ratchet apparatus gives you .003" per click for true precision.
The five pins on the Python are metal, and the fibers are .019" in diameter. The bubble level is adjustable for both 2nd and 3rd axis, and a rheostat light is optional. Also take a look at Cobra's Python Toolless (without the microadjust) and the standard Python, which weighs only 6 oz.
Contact: Cobra Bow Hunting Products, 1-800-352-6272, www.cobraarchery.com