I love Matt sooo much but Dom (and Chris for that matter) are just as valid in Muse and I hate when people forget about them or don't value them as much. Dom is my idol ... even though im a girl... is that weird? :L
Personally, mine changes every day, but 2 that always spring to mind are Bliss and Starlight. Can't say i know why, I suppose maybe because they sound happy, even though the lyrics are a contrast to the sound... If that makes sense :L