A castle with a... wait for it.... Forge!
That would be great, i am tired of how no available to buy houses have forges attached to them. i personally use the hell out of forges.
THIS. I thought that the Solitude manor would have a forge in the basemant, but no, it had a firepit and mannequins. I could do without an Alchemy table, as there's one at every potions store, and in every house, but I really want a completely decked out forge. Anvil, tanning rack, grindstone, workbench, even a smelter.
Especially a smelter.
As for a castle, yes, I do want a castle, one on a mountain top, preferably. There are plenty of mountain tops available that are just sitting there, being all pointy and foreboding and useless. We could find one, knock the top off, and plant a castle there, right? That would be awesome!