Gee, it would be impossible to keep ONLY ONE but I guess today, right now, at this exact minute, I'd have to say it would be one of my Aglaonema plants, probably this one (can't remember the name) because I love the colorful foliage:
Edited to say, I looked through my files to find the name; it's
Anyamanee (Aglaonema 'Dud Unyamanee')