No offense, but reformed Protestantism--more specifically, Calvinism--is probably the worst filth the bear the name of Christianity that has ever been born. There is no common ground between us at all except for the mere name "Christian". The only good thing about them though is that they are at least somewhat more open to theological dialogue (whereas Evangelical-Fundamentalists are more emotionally driven), however, even then I have noticed that reformed Protestants of the Calvinist camp can be very stubborn and militantly won't budge at all, even when you've made a point. Why not have dialogue with Lutherans? They are easily the best Protestants there are who are probably the most openminded and honest out of them all. Methodists can also be some pretty good people sometimes--very humble from my experience--and they also have a concept of salvation that is somewhat similar to Orthodox Theosis.
It depends on the type of Calvinist you speak with. Some are very stubborn, especially from the more fundamentalist sects of Reformed Christianity. However, generally, Classically Reformed Protestants (I'm excluding big, mainstream groups like the PC(USA) and others) are rather knowledgeable, much moreso than the post-modern mainline churches as well as the emotional evangelicals you mention.
While Calvinism is a condemned heresy, I have an intellectual respect for Reformed Protestants that I give to no other Protestant group, on either side of the spectrum. They're intellectual, internally consistent and honest. Really more than I can say for any other Christian sect from after 1517 (except, probably, for Anglo-Catholics, who are the dearest Protestants to my heart).
You may say I'm biased (I'm sure I am), but it's so true that many Reformed Protestants become Orthodox. I was one, and I've met a great deal of former Calvinists since I converted, and I think that's in large part due to the intellectual integrity common among many Calvinists that allows them to analyze an argument logically and follow through. This is much less likely to happen in the mind of a mainline or evangelical Christian.