No, I agree, the ones on my list probably don't go together as well as the New Vision with the RWS. I guess I was going more for going together visually, rather than theme-wise.
The closest would probably by the Dream Cards and Metamorphosis. I think it would be natural to combine an oracle and a tarot with very similar artwork and a similar visionary, dreamlike take on concepts and archetypes.
The two erotic decks, Decameron and Casanova might also be interesting together. They are both about sex, but the Decameron is very earthy and physical (and sometimes silly!), and the Casanova is more refined and mysterious (masks, costumes, etc.) It would be very interesting if the same cards (for example, 2 of Cups) showed up in a reading, or if cards showed up that depict the same sex act but from their very different points of view! Sorry to go on. I know not everyone is an erotic deck fan, but it got me thinking.
I also think the Witchy and Wheel of the Year would team up to make a more meaningful deck. (Not much meat to either one by themselves, in my opinion.)
Or 78 Doors and Wheel of the Year. Same.
And the Dante and Liber T together would be just mind-blowing! Besides being TOO MUCH meaning probably, it might be a good combination of a Golden Dawn, very systems oriented deck, with a non-standard, literature/theme based deck.