Hmm... the N.rajah and the Darlingtonia may be a bit tricky to grow with all of those other plants. They require very different growing conditions. One preferring it very wet, and the other preferring it damp and so on.
They both like well-drained soil, and you may be able to grow them in the same soil mix.. maybe... if this were some other Nepenthes. However, I'm told that N.rajah is a bit picky. Etc etc.
You would need a big mound in the center where you would place your N.rajah so it could get less water. There is the possibilty of simply planting it in it's own pot, however.
The Darlingtonia might also need it's own separate area. A high water table, and a cool, well aerated soil would be recommended. You might want to have this plant on it's own water system too, so you could give it cooler water than the other plants.
I could see an S.purpurea being OK in a wet cold water... but I'm not sure. Again, these are just the first things that come to mind when I read your list. I'm not bog expert.
-Trevor