Why don't you search the internet for information about these citrus? You will get answers more quickly than by posting here, and you will be able to easily determine which varieties sound interesting to you, and select from those that do not need cross-pollination (most citrus self-pollinate, but a few hybrids don't). We can't dictate your personal taste. =)

It doesn't really matter what varieties you have already, unless you are actively trying to produce hybrid seedlings. The fruit itself will not be affected by adjacent trees. Only the seeds, if anything, could be different.

None of the above varieties require cross pollination. In fact a Navel Orange does not even produce pollen. Navel oranges develope nucellar fruit.