Sorry guyz:
I deceded to vote "other" and I'm the only one so here's my explaination.
The #1 thing for discus is for me is "Knowing Yourself" Why is it that you want discus? Do you know what is involved in keeping them? Is your family and you life compatible with discus keeping?
The biggest problem with discus keeping I see is the continuous temptation to buy new fish and all the problems associated with it. If you could get what you want to begin with so you don't keep having to buy more and more and more then you have some chance of success as a hobbiest giving that you can overcome all the other factors that you mention in your poll.
HTH,
Sandeep