So, should I chime in as well and say that the 1st Edition Split Spades didn't have metallic ink? Everyone else has...
OK, kidding aside. The handling of all three decks is practically identical, in that they are Bicycle stock with Magic Finish/Performance Coating. If you find original Split Spades, they were just standard finish, but still an excellent deck series. If you find older Ghosts and Shadow Masters, avoid the air cushion finish ones and try getting the UV500 ones - better stock, and they fluoresce under a UV light.
Silver Split Spades - arguably the most attractive of your three choices, and still on sale for retail at davidblaine.com. It is a limited edition, though, so you'd probably only bust them out for special occasions rather than for practice.
Shadow Masters - a lovely deck, in my opinion; simple and elegant without having "dark" imagery on them to distract. But again, this is a deck you'd save for special occasions - black decks look awesome when new, not so much when the black ink starts chipping off the card's edges, revealing the white paper underneath. Alternately, you could simply stock up on them, since they're always around at E - it's a rare day when they cancel a particular deck that wasn't made as a limited edition in the first place.
Ghost - I think this is a solid deck for cardists. The all-black pips are unique without being utterly distracting, they hold up well and they're not terribly expensive compared to some decks. They aren't limited editions so you won't go crazy if you trash a deck.
For my money, though, crazy as it sounds, I think the NOC deck would be a pretty good cardistry deck, at least for practicing - zero distraction factor with standard faces, backs as plain as they come and they're probably the least expensive deck on the market that's both unlimited and has Magic Finish. The handling characteristics on the NOC are pretty similar to the other decks you mentioned.