The only pitcherplants that you're likely to have success with in a terrarium are S. purpurea or S. psittacina - the others require more light as/and they are much taller (too tall for a tank).
VFTs and sundews are fine, because they are small enough.
You'll want to choose temperate sundews, because a tropical can't deal with the same conditions that the pitcherplant and flytrap will require at different times of the year.
You will need to allow the tank to sit around 40 degrees for about 3 months during the winter, to allow the plants to go dormant. Since you are in New Hampshire, that shouldn't be too difficult in a garage or basement.
Alternatively, you could stick to tropical sundews and then you wouldn't need dormancy. But pitcherplants and flytraps will fail in the long run without a cool period.
I use a soil of 3 parts peat to 1 part coarse sand with great results in my bog for these plants.
Light will need to be very strong. Keep in mind that these plants enjoy full sun. The brightest light you can provide is best - there is no such thing as too much light in this case.
Have you considered, instead, building a mini-bog? Pitcherplants are always happier outdoors. In your climate, it would require winter protection. S. purpurea purpurea is very cold hardy, though, and should live outside just fine.
- Patrick