As I understand it, the eligibility criteria for Dramatic Presentation are based on date of first broadcast, which because of the way that BSG Season 1 debuted in the UK means that the 2005 eligibility covers from S1E08 to S2E09. Within that range, I'd probably pick 'Fragged' and 'Pegasus' as the standouts. Honorable Mentions would go to 'Colonial Day' (although it is rather blatantly 'West Wing' In Space) and 'Home, Part II', one of those episodes where BSG belatedly recalls that it's meant to be sf.