I know what you mean about the pitcher form of N. sanguinea. There's something very elegant about it; rather like the var. elongata form of N. rafflesiana vs. the standard squat form.
The clone of N. sangunea that was circulting in the US for a number of years was known as S-5 and was produced in large numbers I believe by Agristarts in Florida but there are colored forms now arriving in the US including some large plants. Please contact me off-list if you want to know more.