I would fill my barn with breeds that are hard to come by for whatever reason with some proven ones as well. (only ten stalls?) I would have an open house all the time to show off these breeds. They would include some type of draft team to pull a wagon, a gaited horse for me to ride and a nice quiet gelding for my kids. For the 10 stalls, it would be a hard choice. Off the top of my head;
A blue roan Nokota
A black Percheron
A bay Akhal-Teke
A Canadian Pacer
A Suffolk Punch
A black Andalusian
Any TB who can trace back to Man O War, chestnut like him
A grey Icelandic horse
Of course my barn would include people who can ride and work all these different breeds.
I have never been in a really nice barn to know what to wish for. I liked the indoor track that Mr. Savage had. A wash stall with warm water would be nice. A room that has an endless supply of sawdust. Those fancy barns with all the Mahogany woodwork and brass would look great. Of course I would also have to have a worker who whistles as he is scooping poop. I really like the Kentucky paddocks with the white rail fences attached to those barns. Wow, the dreams I will have today, poor DH!