As every trip needs a start date, I've decided 2012 is when I will do Africa
I'm planning a similar trip... roughly 12 months starting around Nov 2011. Don't have a route planned yet, still learning how to fix/drive the landy! If you're interesting in heading off together, drop me a line... either way it would be good to share info.
The Garden route is the most over rated waste of time ever.
You're way better off doing the Klein Karoo leaving CT on the N7- proper.
.We're doing Africa 2010, departing in August so time running out for prep! Just got the carnet and organising paperwork Landy import to SA. We're doing the West Coast, crossing in Angola and then up the East coast to Kenya.
Have a look on our site for some details of prep etc - Tracks in Africa | Overland from London to Cape Town
Still refining the storage/packing bit and proving challenging!