I agree with Kayty- instead of looking at only the breed, try writing a list of what you want in the horse itself. Then, of course, share it with us so we can really help you. For instance- what do you like temperament-wise in a horse? Quarter horses tend to be very calm, and paints follow along those lines. I don't have much experience with ottb's, or thoroughbreds, so I can't chip in with those, but I have heard that they are very different to train. Not necessarily difficult, but different... I also agree that your list of cons is rather lacking for the ottb.
In all my experience with arabians and arab crosses, I can tell you that they are generally hotter than stock breeds like qh's. I'm partial to them because I like hotter horses, but if you want a calm, easy ride, the qh is probably more suited for you.
But keep in mind that every horse is an individual, which is why it's much more important to know what you want the horse to be like than what breed. Although there is a higher chance of encountering certain traits in a certain breed (that's why there are breeds), there is no guarantee. So, again, write that list and I'd love to help you out!