As others have said (both here and on other Orthodox-oriented forums), the issue should not be made "either/or". The two cannot help but be joined together at the hip. I don't think any simple reading of the New Testament, in particular the recorded sayings of the Lord, allow for any other understanding.
If we choose sin, this cannot help but go hand in hand with a diminished, or flimsy "faith" in God and what He has revealed. Abraham was justified by God, precisely because he believed; of course it would be difficult to argue he really believed anything God had revealed to him, if he had also not physically gone ahead and performed certain acts of obedience to the will of God.
In the end, God reads hearts and knows us better than we know ourselves; thus why there will be many saved, who in human eyes gave no evidence of piety or extraorindary lives. Indeed, many will be saved at the 11th hour. Were it not for the Scriptures, and the few eyewitnesses at golgotha, would anyone know that the contrite thief died with true faith and a changed heart? He certainly did not have the opportunity to go out and do good deeds and live a life in this world in conformity to the will of God.
Thus the value of good works is not that they are excellent by themselves, being something God is needful of, and will grant admittance to heaven for them if we have a certain quantity (for example, in Islam the belief is that one's good deeds must outweigh the bad ones; this is not the Christian belief to be sure.) Rather they are simply a part of faith, and there can be no faith without them. The whole "faith vs. works" debate to my eyes, seems to require both a faulty concept of just what "works" in fact are, and a very skewed notion of faith (that puts faith into the realm of being something nominal with little or no substance.)