To answer your questions.
A. Dunno about which ones come with media, but I bought the 2213 last week and got the version with media. However, I think that the 2211 might be too small for your purpose.
B. Classic range does not have the priming function. But its the simplest of the lot to clean and maintain ( assuming you have the quick disconnect ). For me, I just used a pump to pump water in, never had to suck. But yes, priming is a nice to have.
C. Yes, you can add a reactor and a chiller. But you need to make sure the flow is sufficient.
Yes, the Ecco series pumps have the priming function, but in turn you pay more.
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