I need to setup a small net work for 10 staff using MS Small business server 2011, I would need AD, DNS, DHCP and a file server.

How many physical servers is best to buy. I was told that you can have the AD and DHCP in one box but DNS need to be in another box is that true?

I also need to setup a file server for 10 staff. How many physical servers do I need to buy. I am trying to save $$ for the server OS as you can see.

Thanks

Sam