Correct, pleasure horses need a lower headset- pleasure needs looser reins, so lower heads.
I would definately stick with a warmblood, or even a coldblood (irish draught, shire, or clyde) to prodduce something valuable if you sell, or with undoubted conformation for showing. If your going to breed, breed well!
I would only ever cross with qh if it were a western-breed of mare.