The Split Spades are one of my favorite decks and is easily a top 5 deck for handling IMO, great choice. The stock has changed over time and it's debatable what it actually is, but one of these pros might know, I think the most recent version is very similar to Aristocrat.
Also, it's worth noting that the Split Spades aren't actually $12 on his site, it is $12 for 2 decks.
Anyways, there are a few decks I would recommend with similar handling and features:
1. Legends - one of my top 5 handling decks, designed by Mark Stutzman (the same guy who designed the Split Spades, Whispering Imps, and others). If you find them in the right places they won't break the bank either.
2. White Lions - a bit softer than the split spades, also designed by Mark Stutzman, also a David Blaine deck. Also $12 for 2 decks, or you can get 3 (one of each color) for $20. There is a thread that debates the difference between the Split Spades and White Lions here
http://aethercards.com/discourse/playing-card-plethora/white-lions-vs-split-spaces/ . There's an even more detailed thread with all of the Blaine cards somewhere around here...
3. Exquisites - my favorite deck, and the best for handling I've ever used. Go to CARC and the price is extremely reasonable considering it includes shipping.
4. Bicycle Masters (ellusionist) - if you're looking for a cheap deck with great handling that is durable, these are worth looking into. The only thing is Ellusionist shipping can be expensive, so you might as well get the Exquisites instead as combined cost is roughly the same. You may be able to fine some Masters on ebay on the cheap.
5. It's worth noting that Blaine has a new deck coming out soon (when, who knows, but 'soon'). They're calling them "Gatorbacks", and I'm guessing the design and feel will be similar to the split spades.
-B