how much would it cost to build a horse stable to house large horses and ponies?

right my family and i are moving to a smaller house in the middle of huge fields. my mum wants horses again and we were all wondering how much would it cost to build a stable which will house 6 horses 3 large mares and 3 small ponies.
any ideas?

http://www.bridgestrainingstable.com/content/sales/costs.shtm
this site has costs for seprate horses, hope it helps.