As for the ported vs sealed, this is the info I learned from http://www.hometheaterhifi.com/volume_5_2/cmilleressayporting.html , it says Ported speakers aren't accurate as sealed enclosure speakers because ports (and passive radiators) are resonant devices.
The krk 10s sub is pretty good, it is clean and tight and can go pretty loud, I think due to the way it's designed means it intracts less with the room so you get cleaner sounding bass, the Genelec 8020B sound pair with it well.
Monitors tend to have good of axis responce so they can still sound good even if not optimally placed.
Monitors don't have proper volume controls, so you will need a pre-amp , passive volume pot or mixer or something.








