I am not an expert on collaboration but I have seen customers using these two:
http://www.cisco.com/c/en/us/products/collateral/unified-communications/business-edition-6000/qa_c67-703226.html
http://www.cisco.com/c/en/us/products/unified-communications/business-edition-7000/index.html
I am not sure how much you are willing to invest on your home lab though.
Let me know if I can be of help with the UCS side.
In regards to licensing, you will need a license or you can run the 60 days trial period, not sure if that is enough to practice for the CCIE, pretty sure is not.
-Kenny