Incandescent lamps will always be available for use in ovens, where nothing else will survive.
Both isolation transformer and RCD/GFCIs have their place but neither will protect you from a shock from phase to neutral. The advantage with an isolation transformer, is no current will flow from mains to earth, the downside is that, if one side becomes earthed, you lose that protection. An RCD provides some protection, but you can get quite a nasty shock, before it will trip. If you go for the isolation transformer, a leakage detection circuit, which will light a neon lamp, to warn you if one side becomes earthed.