Well, Irindre sent me a message with the following details about Player houses;
ALL CREDIT GOES TO HIM!!!!!

Buyable houses:

Proudspire Manor, Solitude - 25,000 gold
Hjerim, Windhelm - 12,000 gold
Vlindrel Hall, Markarth - 8,000 gold
Honeyside, Riften - 8,000 gold
Breezehome, Whiterun, 5,000 gold

Available Decorations (be advised some of these you can only have with some Houses etc)
Bedroom - 2000 gold
Living Room - 2000 gold
Alchemy Station - 2500 gold
Enchanting Laboratory - 2500 gold
Patio Decorations - 500 gold
Kitchen - 1500 gold
Entrance Hall - 500 gold
Loft - 200 gold
Dining Room - 250 gold
Armory - 2000 gold (only in Hjerim House)
Garden - 800 gold
Porch - 400 gold

All houses will allow for weapon racks, weapon plaques, mannequins, and bookshelves.

And these are bought seperately from the other upgrades?

I'd assume soo...That or they are already included

I see thanks Eden!

Slight clarification, not all houses have weapon racks, weapon plaques, mannequins, and bookshelves, but only a combination. For example, the house in Whiterun doesn't have weapon plaques or mannequins, but it does have bookshelves and a weapon rack.