Wow, I haven't read all the posts, just about half. My advice is to cool your jets, you are way too emotionally involved in the whole idea right now. 10K for the horse and almost 5K/yr boarding, then vet and farrier costs? Most guys with that kind of money are too busy working to have the time for a horse. Don't be an askhole, you asked and got some great advice. Allow yourself a cooling off period to take it all in. I have 2 Morgans both 15/2. They cost me between 2 and 3K to keep on my place between feed, vet, farrier, wormer, etc. But, have one little problem and you are looking at another 1 or 2K in vet bills.
I would look at a small horse before a big horse for the mountains. If you want a horse of your own to ride and need a second horse for packing, rent it.