N. sibuyanensis:
This is one of my favorite plants. It makes long tendrils, and nice, round pitchers. In my experience, it is pretty easy to grow, but kind of the "cat" of the Nepenthes world. It does what it wants to, when it wants to. The larger one developed a beautiful pitcher, and then just stopped growing for a month before deciding to open it. I haven't had the smaller one long enough to see it do anything like that, but I'm guessing it will behave simliarly.
N. spectabilis
This, too, is one of my favorites. I've had this one for quite a while. It is one of the tougher highlands- I would put it right up there with ventricosa for durability. It steadfastly pitchered in near lowland conditions for almost six months. Now that it is in proper highland conditions, it has really taken off. In good light, the leaves turn a very dark red, almost maroon. This has been the easiest to grow of all highlands that I own, and also is a quick grower. I've included a picture of an older, but still active pitcher (this plant typically has four or five at once), to show how the pitchers color as they age. The inside turns a nice shade of purple. You can see some flecks of purple coloration in the new pitcher above, and these will increase as the pitcher ages. If you look closely, you can see tiny, green peristome teeth in both pictures.
N. inermis:
This plant is pretty new, as well. Rght after I got it, it just got to work and made a new pitcher right away. Seems to have about an average rate of growth compared to other highlanders I grow. It has not needed any special care.
N. muluensis:
This is a pretty, small plant. It was given to me by Jeremy (brisco225). It is definitely a slow grower so far, but I think it's worth it since it has such intense coloration throughout the leaves and pitchers. I'm not sure if the camera made it look a little darker or not, but the color is an incredibly dark purple, headed towards black.
N. tentaculata:
This plant definitely needs its night time cooling to be happy. But now that it is getting the proper temperatures, it is a very low maintenance plant. Mine has two main growth points, and they both pitcher prolifically. Each leaf is getting significantly larger, and I can't wait to see how big the new pitchers will be.
. The newer leaves are also starting to show a little bit of coloration.