If marriage is a serious consideration, you and your prospective bride may wish to study together the two faiths, discuss the differences, and determine which one you believe to be the One, Holy, Catholic, and Apostolic Church. Then, decide to both be of the same faith so that your marriage and future offspring (if it be God's will) will also be brought up in one faith. This would be the very best way, if you both are willing.
Otherwise, you could both remain as you are, in different faiths, and discuss the matter with your respective priests to see if they will marry you, and what the implications of such a marriage might be for the participation of you, your wife, and future offspring (if it be God's will) in the life of your respective churches. One thing to keep in mind, however, is that some Orthodox priests (I'm not sure about Armenian) or jurisdictions may be very, very lenient in the matter, and just allow your prospective bride to receive the mysteries and fully participate in the church. Some more traditional Orthodox priests and jurisdictions, however, would consider your wife to belong to a heretical group and would not let her receive the sacraments. So, it is important to keep in mind that even if your particular priest is very lenient and acts like there is no difference between Orthodox and Armenians, this could be a serious issue if you ever move to a new area, or if you wish to attend another Orthodox Church as a family.