You have an easy, medium, and hard Nepenthes here. N. talangensis is a relatively hard plant to grow, and is very hard to get to pitcher. Temperature should drop into the high 50*f range, with high humidity. N. robcantleyi is easier, but very slow growing, and makes annoying 'little lid' pitchers unless it likes its conditions. It will need conditions similar to N. talangensis. I don't have much experience with N. chaniana, but it is a Bornean intermediate that should be as easy to grow as N. maxima. Of these plants, it might be the only viable windowsill candidate