If you can get ahold of a boroscope, you might be able to see the underside of the valves, and see if they are bent. I find it odd that it would run well at all, then all of a sudden do this. The only thing that would make sense in that scenario is if the thing jumped time but a couple of teeth. You say you checked the belt, and it looked new, still. That kind of tells me that didn't jump time, though you never know. Double check the timing, find a boroscope, and see what you can see.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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