DHCP redundancy

Hello all. I am going to be setting up (replacing) my current servers with
new Win2k8 servers and I was
wondering about DHCP redundancy. I believe I read that Microsoft has DHCP
redundancy through the use of
clustering, but it still uses a single database? I was also wondering if
this would work.

Server A. has all the DHCP scopes and they are activated. Server B has the
same scopes, but it stays
inactivated until Server A dies, then just activate the scopes on Server B.
This is for a small business with
less than 1000 clients and a staff that is always on call.

Thanks for any help on this.