Have you considered a Priv? Its a BB on Android, best of both worlds. Last year I was in a similar situation as my Z10 was actually almost 4 yrs old. It worked fine, but it was time for an upgrade. I can't support Apple for many reasons, and I considered the Samsung. The issue was I had TONS of stuff on my Z10, and the Priv, although Android, still a Blackberry and as such, made the migration from BB to Android "almost" seamless. About the only thing I have to transfer manually was my Blackberry Maps entries. I have buddies at work that went from BB to iphone, and they lost tons of stuff. Even the IT guys gave up on it... They would have to transfer everything manually.
Something to consider.