Welcome!
Since "pleasant aroma" usually means "pleasant aroma for nonsmokers" (which, believe me, can be wildly opposed to what a pipe smoker will consider a pleasant aroma), that typically means an aromatic. Since you're brand new, I'll just note that there are, broadly speaking, two categories of pipe tobacco: aromatics and non-aromatics (which include "English" blends, straight Virginias, Virginia/burley mixtures, etc.) The main difference is that aromatics have been flavored with something other than tobacco to give them aromas of fruit, coffee, chocolate, pastry, bubblegum (yes, really), etc. Some non-aromatics do include light flavorings of rum or cocoa or vanilla, but they will still taste and smell much more like straight tobacco.
There are literally hundreds of aromatics. The most popular is called 1Q. It's available by that name, but it's also commonly rebranded by brick-and-mortar tobacco shops. If you're buying in-person, just ask which blend is Lane's 1Q. (In Tinder Box stores it's sold as Wilshire.) Another very popular aromatic is Stokkebye's (STOKE-a-bee) Nougat, which is also commonly rebranded by shops. (Tinder Box sells it as North Sea.) Both blends are quite mild to smoke -- you won't get a lot of flavor from either one -- but they do smell very nice and they burn quite well. (Some aromatics, because of the added ingredients, can be overly moist -- goopy even -- and can tend to burn hot and even bitter as a result.)
So-called English blends contain a tobacco known as latakia, which has a very smoky, campfire taste and aroma that a whole lot of us find very appealing. But this tends to be the one leaf that nonsmokers cannot stand. Frog Morton's Cellar does contain latakia, but the Frog Morton series is known for the unusual way it handles latakia, making it much more mellow -- and even sweeter -- than any other series from any other blender, as far as I'm aware. If you feel like testing the waters with your wife, that would be an excellent one to experiment with.
Anyway, I'd recommend any one of these three for you.
Bob