Go for the Garmin Nuvi 55LM (5" Display) or the 65LM (6" display) - both are new generation (2014) devices, with the latest City Navigator maps pre-installed - and, as mentioned above, FREE lifetime updates for the useful life of the product.
These map updates (and any firmware updates) are installed via the Garmin Express software, which will install itself onto your PC the first time you connect your Nuvi to it, or can be downloaded & installed separately.
The 55LM usually goes for R 1899 - R 1949 or so, but the bigger 65LM model is on special at Incredible Connection from 19-22 Feb, at a reduced price of R 1999-90 (R 400 saving).
55LM details -
http://www.garmin.co.za/prod_detail_55lm.php?productid=489
65LM details -
http://www.garmin.co.za/prod_detail_latest.php?productid=479
There is also a local forum -
http://www.gps-users-forum.co.za/ - that provides a FREE monthly Road Hazard & Traffic Camera Alert Points of Interest (POI) database, which can either be compiled manually & customised using Garmin's POI Loader software(the option I use) - or can be downloaded in a pre-configured format - with or without audio alerts.
Garmin also provide their own Traffic Camera alert database - Cyclops - with regular updates, but this subscription costs an additional R 320 a year.
The 55LM & 65LM have a range of useful features, with apps like Trip Planner, ecoRoute, Where I've Been, Mileage Reports, and Lane Assist guidance, with overhead road signage prompts.
Using the traffic alert database, in nearly 5 years of owning a Garmin Nuvi, first the 205 and now the 55LM, since July last year, I have never had ANY speeding fines, from either fixed or mobile cameras.