I wish I had a clear answer, but I'm still figuring it out my self. I like pretty much all horses that are forward and athletic, so draft cross and lighter. I like a smart, observant horse with a big heart that loves to work, and has lots of personality. For practical mounting on the trail I like to stay under 16hh, and with a wider barrel
So that leaves me with members of most of the breeds out there
I currently have an arab that I love, and an appy that I really like. I have owned members of many breeds over the years. My favorite was probably a hanovarian cross.
As for color, I would like to own a grulla one day. I like some chrome, strips, white faces and high white socks, but I also think a horse that is completely solid colored is nice too. I've owned some amazing colored horses with crappy personalities, so I really learned the 'don't pick a horse by its color' lesson. I like any good horse.
And I'm a mare person.