Take a look at this project: https://github.com/austinrivas/meteor-postgresql . If you really need to use a database other than the mengo meteor, this may not be the right choice if you are not experimenting. You can always aggregate data from another db to mongo, which can make life easier.
I used D3 with a meteor in the form of angularjs directives and bound data to control the visualization in $ scope. DDP makes data storage relevant in d3 visualization super convenient.
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