How big is your room? What kind of power do you need for those speaker choices?
EDIT: Decided to look them up.
Those Paradigm Studio's are 92 db sensitive. They should get plenty loud quick. The CM8/9 and 88/89 db respectively. The Dynaudio's are 87.
If there's any chance you aren't changing speakers, the XPA-2 may be more than you need. For the three candidates, the XPA-2 should do very well.