I'm very new to the game, however I have three decent AQHs. I have thought about breeding something a little less popular. 

I really like:

Cleveland Bays

Morgans

American Saddlebreds

But I also like horses with colors such as duns. Should I stick with AQHs?

I haven't thought much about dogs yet, but Im leaning towards Chesapeake Bay Retrievers!

Go with quarter ponies! I think theres like only 1 breeder left...they were my first breed on here, but i switched to paints, so my qp lines died

But they come in the same colors as aqhs!!!

Out of that list you like, i'd say American Saddlebreds. Quarter Ponies are amazing.... and I personally am breeding Comtois Horses whom are stunning as

Saddlebreds!

Or Morgans.

But you really want to breed Icelandics.

Link Tree

Cleveland Bays

National Show Horses can give you color and there are pinto patterned Saddlebreds out there! :D

Colored Morgans are turning out to be pretty popular in real life. I know a few people with Cremellos!

As far as dun coloring...AQH's, Quarter Ponies, and Mustangs would be your best bet! :)

I'd suggest Paints :p As far as dogs I'd love to see and have another German Shepherd Dog or Weimaraner breeder! It would be nice to have someone to buy/sell/trade pups.

Paints since 6-8-14

I can't decide! Lol

Icelandics come in any color, so... :D

Quarter ponies!!! AQHs!! Spanish Mustangs!! Lol

I really like Morgans if I had to choose from your list.