For what it's worth: most puncture problems these days are fairly slow leaks caused by self-tapping screws working their way through the tread so I've settled on Ultraseal as a means of minimising the hassle that would come with a flat. And no need to change to a spare, so no need to carry one! (http://www.ultraseal.com)
For a major 'blow-out' then yes, the rims could be damaged, but chances of this happening are fairly small - so make up your own mind based on previous local experience.
After a year I gave up on run flats as too hard, too 'shocking' to the suspension and the rest of the car innards. Now enjoy much improved running on regular Dunlop SP2030s, which are expected to be fairly long lasting and do give a comfortable ride. Dry handling and braking are good, wet handling and braking are OK, but Bridgestone RE040's are allegedly better. (Have a look at the test reports on: http://www.mytyres.co.uk/start.html)
Good luck with the research - hope a month is long enough !