I just got 4 white skirt tetras and I love them. They really are quite a beautiful and graceful fish. I would highly reccomend them

Have fun stocking your tank. It's good that you are putting a lot of thought into it and reading up on information instead of just going to the LFS and coming home with impulse buys (that never turns out good). I wouldn't do gouramis with the tetras because they are semi-aggressive fish and will bully the peaceful tetras. Here are a couple suggestions of what I would do:
1 Angel (6 in)
5 White Skirts (10 in)
5 Cherry Barbs (10 in)
1 Bristlenose Catfish (6 in)
This puts you about 2 inches over the limit, but the inch per gallon rule is just a general guideline. As long as you keep up on your water changes you should be fine.
6 Tiger Barbs (18 inches)
2 Gouramis (10 inches)
1 SMALL Algae eater
Have fun setting up your tank!