Done. He's blocking you now. I clicked only "Prevent Messages from this poster"...and filtering is on.
Quite honestly, I see no reason for two levels of block.
I'd say one type of block.
Put a person on block, you can't:
1) Read their messages 2) Get any kind of message from them - public or private 3) Write to them
Two places to click "Block this Poster" -- on the PM view and on their profile.
Simplifies things. I can see questions coming already from people...Because you have the easy-to-toggle filtering, I don't see why this would hurt anything.