Robert,
There are no websites in English for real estate in Nanning. There are Chinese websites which give this information if you want to get a Chinese person to assist you in your search.
At the moment prices are steadily increasing. There is a lot of new property available. Expect to pay over 4000 rmb a square metre for new property. New property is sold as empty shells, bare concrete walls and floors, you have to fit
everything yourself including plastering, electrics, plumbing, sanitary fittings, kitchens etc.
It is difficult to recommend a good area because it will depend on your personal preferences. Do you need to be downtown or more remote, near schools or work, etc etc
To give you an example, my 3 bedroomed, 2 bathroom apartment is for sale at 4500 rmb/sq.m fully fitted out. It is in a good area on a gated estate with gardens, swimming pool, tennis courts, gymasium etc and I like it so much that I am moving to a bigger apartment in the next building. It can be rented fully furnished for 2500 rmb per month for a lease of at least 1 year.
Graham