Might I also suggest looking away from the Scriptures as you search for an answer. Orthodox do not start with scripture and then reason our way to various doctrines and practices. Scripture grew out of the living context of the Church in its relationship to God together with its associated practices. Thus the Scriptures are understood in light of the Church not vis versa...like St. Paul said, the Church is the pillar and bulwark of all truth.
Try this as well...an old test I'm sure you've heard of...the fruit test. Trees should be able to reproduce after their kind. Bad fruit=bad tree. Good fruit = good tree. But how do you evaluate given the variability in human behavior...you might have a good tree but a few wormy apples...which worms are not the fault of the tree. So do this look at the very best fruits the traditions you are investigating provide...especially close to our own time and not in some distant near legendary era. See who among the claimants actually produce men and women of an apostolic era caliber...men and women whose depth and clarity of faith and purity of life could stand shoulder to shoulder with the apostles and saints of that earliest generation. Basically...which groups that claim to be the Church actually are able to reproduce in kind. Find those souls; study their lives and faith, then go back to history and the Scriptures, and you will know which path if follow can get you to where they were...and are.
On the Orthodox side let me suggest a few lives from the last 200 years as a beginning:
St. Seraphim of Sarov reposed 1833 (a portion of his life you might find interestin: http://www.orthodoxinfo.com/praxis/wonderful.aspx
St. Herman of Alaska reposed 1837 (http://www.fatheralexander.org/booklets/english/herman.htm
St. John of Kronstadt, reposed 1908 (http://orthodoxwiki.org/John_of_Kronstadt
St. Silouan of Mt. Athos, reposed 1938 (http://www.fatheralexander.org/booklets/english/siluan_e.htm
Elder Cleopas, (1998) (http://www.orthodoxinfo.com/praxis/counselromanianelders.aspx
Elder Pasios: http://orthodoxwiki.org/Paisios_(Eznepidis
Elder Porphyrhios: (1991) http://orthodoxwiki.org/Porphyrios_(Bairaktaris)_the_Kapsokalivite
Elder Sophrony: http://orthodoxwiki.org/Sophrony_(Sakharov
Mother Gabrielia: http://orthodoxwiki.org/Gabrielia_(Papayannis
That's a beginning. Follow some of the associated links for further information. If any of them intrigue you, look for books on their life and sayings. How do they compare with the great lives you see in the NT? And having done that...see if you can find souls like them in other traditions.
Speaking for myself, though I have encountered many wonderful souls in other faith traditions...I find nothing like the depth and consistency that find in the Orthodox tradition in this regard. And in my opinion, those in other traditions who came closest to these souls are those whose faith practice had a lot in common with theirs.
The cinch for me was St. Seraphim of Sarov. At the time I was a 21 year Charismatic and I'd never encountered anyone like him for all the big talk and claims I had heard. He could have stepped off the pages of the NT in my opinion. So I figured since the type of life and faith that he had was the type I wanted, it made sense then if I had any expectation of even minimal success to believe and practice as he did.
Without belaboring the point, it has been challenging, and a cause of constant wonder...like the walled garden in Narnia that was bigger within than without, with even bigger gardens, one within the other at its heart...glory to glory, as it were. It's not been flashy, not easy, but beautiful and demanding and fulfilling in ways never touched upon in my protestant life.
The best advice I ever received on this point, or that I can give is simply taste and see. If and when it is time for you to be united to Orthodoxy, that's the Holy Spirit's job.