Looking or cotravellers to Namibia - beginning of 2015

Hello we are an easygoing couple from Czech republic and we are looking for preferably also a couple to join us for cca 1 month travel over Namibia /possibly also Botswana and may be partly South Africa as a start point if the flights are cheaper, if not windhoek would be the ideal base/
We would like to rent a 4WD and explore the country.
You can write to info@ldcon.cz
Plan: first months of of 2015