I just set this up for a 10 user office. It is my understanding that you can run a max of 10 virtual pcs / servers using the starter pack license. So if you run your 2008 virtual servers that will be included in the 10. You will need 3 2008 machines. One for vconnect, one for vspehere (with vcomposer) and one for your security server if you plan on using it over a firewall.
So if you put all 3 vm servers on the main server then you will only be able to run 7 virtual desktops.
I had an old dell 2950 and increased the ram to 32 gigs. It is running my 3 2008 vms for view and 1 sbs 2011 server with my AD. It is running in free mode right now which is usually fine but I want to use VEEAM to back it up and they require you have a vsphere license on a server you want to backup so I might buy the vmware vsphere essentials which comes with 3 vsphere licenses so I can run my 2950 in full mode.
Good luck!