Good job. I use a hybrid system as well, consisting of a hPDA and a Backpack account. I must say, tough, I consider Backpack my "backup" iteration, as I rely on the index cards most heavily.
I used a Moleskine for a while, but went back to cards. I felt that the Moleskine began to feel "cluttered" after a while, when I couldn't remove heavily marked pages, plus my "inbox" page would eventually "move" further away from my context pages as I filled those.
Conversely, I can easily remove "spent" index cards. While the Moleskine is certainly more attractive, I found it less functional (for my own needs).