Not sure about "the best", but these paclites are available in short leg. I've had a pair of Sprayway for a few years and find them effective.
http://www.gaynors.co.uk/products/shop-by-category/gore-tex-waterproof-clothing/mens-gore-tex-waterproof-clothing/details/i/12265-45b50/n/mens-paclite-pant-short-leg.aspx