I read on a different thread that someone used spiderman stamps and saw a good response rate so I definetly say use unique stamps! 

It is a very unique area.  

Each list will have a unique function and unique combination of fields (in addition to the normal ones like name, property address, contact info, etc).

I don't have anything to add but I did want to say, that house has very unique curb appeal. 

I think you are going to be surprised over the "unique" problems you run into that are going to run your expense up much higher. 

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Call the building division and ask. 

Esri defines 67 unique classes of US hoods with regards to A-D class. 

MPD is a very large department and not even division knows what the other is doing.  

While in my opinion it's perfectly ethical (so long as you haven't signed an exclusive contract with any of them), it would seem you're wasting their time by having them all do pretty much the same thing.Of course, if more than one of them are bringing you pocket listings or providing some other unique service, that's a reason to keep more than one...but if they're just providing MLS data, I'd rather focus on building a strong relationship with the best one.