While its awesome you love your phone as its really the only important thing, you have to acknowledge a few things.
1. You're comparing your phone, brand new, to older phones that are over two years out of the tech race.
2. Your wife's phone (android) is far more flexible and she could put a WP tile theme on it to make the UI identical.
3. The only feature you actually have that she cannot do (or iPhone4/latest BB) is the tight relationship to Live.. and on Android you can actually tie to Live in many ways via 3rd party apps. It will only continue to get better as MS has now opened up their framework for quick and easy traversal among WP7 and android/iOS.
4. Using either Amazon, Google's Music, or iTunes, you can keep all your media off your phone and use from anything else from any Android or iPhone, respectively. Hell, with Google Music I have my music also through my Ps3 or Wii. Can't do that with your Live based setup.
5. Samsung is awesome for tech (I love my Fascinate), however, I certainly hope their software upgrade policy is better than what the US Galaxy S phones had. Otherwise you'll be waiting for a year to get Mango.
6. Without Mango, there are TONS of basic use features you don't have as compared to Android or iOS and when Mango releases, we'll have to see the eventual rollout to see what it may still lack... as well as gained.
7. Android = free or really cheap apps. WP7 and iOS = pay.
