Good for you and your gf, soon to be wife! Links will be forthcoming in numbers from those who keep track of such things, but if you're both avid cyclists I'd start looking for a used tandem. Might take a while to find something in your size, but at the KHS price point you have a good shot of finding a higher-end tandem.
I'm sure you've already figured out that when you and SO are riding the tandem you will be a very popular addition to many pacelines.