There's plenty of action on DVD this week, both from the past and the future. 'Clash of the Titans,' a remake of the 1981 cult-camp-classic, zooms home with swords, monsters, gods, demons and a lot of beards. The action-adventure was lauded for being good, old-fashioned B-movie entertainment, but panned for a weak script and paycheck acting. Fast forward to the future of 'Repo Men,' where getting behind on your bills could mean your life. This sci-fi actioner gets marks for special effects but depends too much on gore and dumb buddy banter. Read on.