Seeing all those titles sure brings back good memories of old times... [sigh]
But since we live in the present:
You will need some of the big running titles ported, even if it was just to provide people with up-to-date games or titles that are in the news.
Next would be recruiting some of the former softwarehouses-Team 17, etc.
But then again the best games are often the ones that pop up from nowhere and suprise you.
Focus at gameplay/story/fun - more than often it's visuals these days. Visuals OK-but 100% eye candy??