lol I was in the same position with my boyfriend. I was dead set on getting a cockatiel or parrotlet or something last year but he convinced me to wait... then friends of his moved to Europe and wanted to give us their finch (small snowball). Then we got him and he was sick, I nursed him back to health (snowball starts to grow) then decided to get him a bigger cage (bigger snowball) and a girlfriend, Andie (snowball starts rolling down the hill). Well Alfred ended up passing away, he was old and had been sick a long time. I wanted to give Andie away and get a budgie or parrotlet (snowball would have melted) BUT John talked me into getting another finch, Sam (snowball starts gaining momentum) then they started breeding, then they had babies and now we're planning on building a large indoor flight cage that will hold the 2 zebras, 2 shafttails and 3 button quail (snowball is now an avalanche).
Basically what changed John's mind was how happy the birds make me AND he realised how easy they are to care for. They make a bit of a mess, but you can fix that with cage liners and so forth, they do NOT smell, unless you let the bottom of their cage get wet and moldy and they're really entertaining!
I too was going to do zebras, goulds and owls, but after talking with people here I decided against putting the goulds and owls (passive birds) with the zebras and am now planning on the shafttails, which are very pretty and have a nice song. The button quail are an indulgence for me

I'm going to be putting down linoleum for the floor and a thin layer of playsand for substrate, mostly b/c the button quail need to dust bathe in it. I was going to do a mesh floor with an access door, but since deciding on button quail I squashed that idea, since they can't live on a mesh floor. The button quail were actually instrumental in simplifying my flight cage design
I would have a talk (calm talk a couple glasses of wine, I find visual aides and facts and figures are also helpful) with your wife and find out why she doesn't want you to get the birds. John's problem was: smell, noise, expense and responsibility. He feels much better now that he knows they're not smelly, not really that noisy, not hard to take care of and not really that expensive, in comparison to our cats, crabs and ferrets. He was also dead set against the flight cage, until I showed him my plans, did research on building materials, it shouldn't even cost $100 to make mine, and showed him pictures and let him hear the songs of the birds I'm planning on getting. He hasn't been informed that I'll be getting a budgie for the old finch cage yet, but he will and he'll get used to the idea

Good luck with your wife, I'm sure once she realises that the birds will make you happy and not really impact on her daily life that she won't mind.