I also realized that neither of us have really answered your question, we have been focusing more on plumbing it inline. While I agree with Mrkroom, you should use as high a head pump as you can with a Mazzei, I saw decent results with a pump similar to the Eheim 1084 you are considering when I had mine running on a separate pump. Just to have fewer things running in and out of the aquarium though, I wanted mine to run inline with everything else.
Also, if you do decide to run it inline, you really only need one ball valve. Save yourself the $6.00 they cost at Home Depot. The 2 in Mrkroom's loop are redundant.