Sounds like you two had a great first experience! Congrats!
Whatever you do, do NOT buy a Raleigh Coupe. We've had more issues than Carter's has pills (think I just came up with another qualifying question for the <50 folks). We weighed it today and were shocked to discover that it weighs 41 lbs. Holy cr*p! It's not a tandem, it's a tank!
However, it's been instrumental in helping us hone our skills at tandeming, and we're having a great time with it. We now know that it wasn't made for the uses to which we've applied it -- centuries, massive hill climbing, time trialing -- and since we're pretty good on it now, we can take our time finding our upgrade.
Someone wiser than I said it best: Wherever your marriage is going, the tandem will get you there faster. I hope you have many happy miles two-gether (TM Rudy & Kay).