Agree with both posters that sticking to the same manufacturer is your best bet. Mixing speakers in your setup could mean excellent sound or a disaster in terms of matching, the risks are high, unless you are some sort of a daredevil who wants to experiment and not regret loosing money in the process (buying, then selling and again buying)!
Studio 20 are not a very difficult load and your Denon will cope well with Studio 's20 all around. You could also consider the excellent subwoofers that Paradigm makes at a later stage.
Studio 20 are not a very difficult load and your Denon will cope well with Studio 's20 all around. You could also consider the excellent subwoofers that Paradigm makes at a later stage.