Best way to use multiple domains

I have multiple domains that are the same or almost the same as my dot_com moneysite.

exact example
-XXXX _dot_net
-XXXX_dot_pro
-XXXX_dot_co
-XXXX_dot_cc

similar example
my-XXXX _dot_net
our-XXXX_dot_pro
the-XXXX_dot_co
best-XXXX_dot_cc

What is the best way to use them? Mini sites link to money? Linking to each other, then 1 to money?

re-direct?

I would seriously appreciate any thoughts on this.