This is a very good question.

Here are my thoughts. SPec A's don't make enough power, Spec B's break timing belts, Spec C's don't idle.

I think SPec B's are the way to go but I want a cam that can use a stock timing belt.

Skunk2's seem to be making very usable power for a lot less cost. AJ can better elaborate since he is using skunk2's but power per dollar the skunk2's are probably they way to go.

That being said Todas do have a sense of bling about them and skunk2's still carry a stigma of riceboy parts in some cases so it makes the choice that much more difficult. I would say something else to look into are Jun 3 cams.