I personally can't hear enough difference to even come close to justifying the price difference. I think there is a big difference between 805 and 804. Then there is a big difference between 804 and 803. There is not as much difference between 803 and 802, but there is almost no difference to my ears between 800 and 802.
I would say if all you were ever planning on doing was to listen to 2.0 music, the right choice will probably be the 800D2. If you had any inklings of getting a sub or doing movies, I personally think you should save your money and spend it on... whatever else to make your entire experience more whole. Of course this is assuming you don't have "unlimited' money.
And for the record, I auditioned both 800D2 and 802D2 in the same room next to each other off the same equipment a while ago. Yesterday, the speakers were in different rooms and 800s were run off all Classe and 802s were run off all McIntosh ( tube amp).
funny thing, yesterday I auditioned of the 803 di side by side with the 804di with the same gear mcintosh and yes exist a huge difference but in a bad way although the bass in the 803 is wonderfull the mids and highs was really hidden, I not think that it will have a close performance to the 802di at least to my ears. just my two cents.