I prefer the convenience of banana plugs; they are easier to remove than spades. In addition, hooking spades to the back of the receiver is true pain, especially with 12 gauge wire. (I have an Arcam AVR300 also).

If you choose to get spades, just be sure that they will fit your speaker's binding posts. I initially bought speaker cables with spades, and they did not fit my speaker binding posts. I had to return them, and I ended up getting banana plugs. It turned out to be a better choice for me.