SQL Server or servers for the hosting?

As you are all aware there are various Databases required during installation for all sorts of things.

Virtual center, Update manager, Anti Virus, vCloud Director, Chargeback etc and the list goes on.

My question is how many SQL servers should I use within the solution for these?

The SQL servers will be virtualised within a management cluster but my SQL team want to house all DBs on a single server.

I had spread the load across a couple of SQL servers as to me it seems easier to load balance a couple of 4 proc servers than a single 8 proc server with a large amount of RAM.

I wondered what everyone else does with their designs??

Thanks