In my opinion, Haibara's relationship with Conan is platonic, or maybe a mutual respect, perhaps partnership. I also like to think that the two were bonded through their similar experience and situation in shrinking and being hunted by the Organization or their skill set, which works well together. Though currently that is all there is between them, people grow and change, and with the similarity between Haibara and Conan, it is possible for their partnership to become more.
As for Shinichi and Ran, it is a more platonic-romantic relationship, a relationship developed from friendship, now that they are officially dating. But right now, you can consider it a relationship built on lies, and we all know how well those go. However, with such a strong foundation of friendship in their past it is possible for Ran to not react badly as the truth came out. Though not highly possible, I'd say the possibility is 50/50, between reacting badly and rejecting Shinichi and accepting the whole ordeal, as Ran can be quite emotional, however she have shown that she is also a logical and accepting person.
So, in the end, I am neutral in the entire ship-thing. I have basically no preference and as long as a fanfic is a good read, I like it.