I have all three decks you mentioned. I like the White Lions the most of them all. The Blades White is OK, but I'd go for the Blades Midnight - I liked it more. And I hear there's a Blades Blood due out soon...
If you're trying to economize, just get two of each instead of three. If you had to kill one purchase, it would be the Blades. Better to buy rare decks now while the prices are still reasonable, since these things have a tendency to get more expensive. I recommend the davidblaine.com deal for two decks, one signed, for $25.