Top Bucks - Has all of the niches you are looking for.
Soulcash - They have some of the best black sites you will ever see and 6'9" is pretty cool and helpful.
GammaCash - Another big sponsor that has a nice variety of sites.
Platinum Bucks - They have a ton of sites in a lot of different Niches as well
&
Scores Cash - This is a fairly new sponsor I've been using a lot lately. They have some pretty nice Black, Latina & Mature sites among others. Use them while they're still fresh.
Also check out Fantasy Man Cash. They have a ton of sites you will be able to use
Good luck!