Weighing between Kronos and Montage, I also would opt for the Kronos due to the ample-size libraries it allows. But it's a pity the Kronos got heavier as well with its last version.
The Montage strings I heard again in the Japanese demo are very nice, but are they breathtakingly realistic? I'm already used to very good ones when I combine the best of Motif libraries and Integra...