you could just buy the 10 user starter pack this will give you ESX and 10 VDM licenses, I am assuming here that the guest Server will be the VDM server and not a File and print. if it is to be a file and print then you will have to get a full ESX license (note you can use the ESXi free version here) and just the VDM licence packs rather than the bundle.
That said for such a small environement with 10 VDI guest, you could just create direct RDP connections to the VDI guests and have a 1 to 1 environment, this would cost you nothing in VMware liceses as it could be done with the Free ESXi product
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Tom Howarth
VMware Communities User Moderator
Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410