While I think Sanders would be good for our country, reading up on his foreign policy indicates the usual story for nations abroad. We'll continue backing Israel in their conflict with Palestine. Hard to say how messy our relationship with the Middle East will become. China? I don't know enough about it comment.
Israel/Palestine would be no different under a Clinton presidency. Her foreign policy record is abhorrent. She voted yes for the Iraq War. As secretary of state, she upgraded an insecure consulate in Tripoli to embassy status, then a known Al Quaeda stronghold, and when shit went down in Benghazi, she blamed it on an Islamic protest video to shirk criticism for being so shortsighted. She ultimately accepted responsibility for both, but nonetheless her decisions seldom reflect scrupulously the best interests of her people abroad.
Furthermore, Obama was the first president to stand up to Israel in any kind of way, and look at the heat he got for it. These are precarious times, and the best thing our country can do is support an international coalition in the Middle East. Sanders is a secular Jew, and not a bedfellow with the Israelites like Clinton most certainly is, so if anything, I think your concerns would be better met by Sanders.
She has said plainly she is not adamantly opposed to "boots on the ground" (cringe) in the future. I'd encourage everyone to watch the three remaining debates, the first one tomorrow in Wisconsin on PBS. If Clinton secures the nomination, I'll swallow my reservations for her and vote, but I predict the popular vote will sway in Sanders' favor and if she gets the nomination, it'll be through some vetoing of that popular will or through the constant disservice of corporate media, superdelegates and other party establishment figures.
The money is everything. Look at where Clinton's money is coming from.