No one has been rude, or judgemental to you. They are simply giving out VERY sound, constructive advice. No one here thinks that you are unintelligent or don't know the difference between X and Y. By getting so riled up and defensive, you make people not want to post and give advice in fear of being pounced on. Chill out and take it all with a grain of salt.
I agree 100% with Spyder.
Is she Registered? Honestly, there is not much of a market for a Quarter Horse/ Percheron/X. You have to think about what happens if one day you can't take care of it, or something happens and your forced to give it up. What then? Are you positive that she will have somewhere else to go? Will she be marketable?
As for studs, if you are dead set on breeding her, really try to honestly evalute her. Write down a list of all her conformation/performance/disposition/bloodline pro's and con's and then look for a stud that would compliment her and balance out her faults (eg: if she has a long back, look for a stud with a shorter back that is PROVEN to throw foals with short backs).
It's really hard to find a stud that would compliment your mare without having pictures that show off her conformation- standing square on flat, hard ground.
She looks like a very sweet girl :)