I would also advise against getting the female bettas, especially with the angelfish. I had to add a couple of my girls to my community tank temporarily when my sorority tank didn't work out, and my bettas did not do well. They hid constantly and were really stressed. Also, what are the dimensions of your 60 gallon? In a tank less than 4 feet, if you have 2 angels that pair, in the tank, you will likely have to get rid of the rest due to aggression.
Here's a profile for congo tetras which should be helpful:
http://badmanstropicalfish.com/profiles/profile39.html
Best of luck with the tank
