Go with the Alclad 2, definitely the best way to paint NBM finish. SnJ is also good, but not as freely available as the Alclad 2. Failing that, if you have the time, you could use bare metal foil.
I have seen good results on models from people using Tamiya chrome silver acrylic or their silver spray cans. (you could also decant the paint and airbrush it)