I never was a big fan of digital service until now.
If I could I would love to trade all my PS3 and 360 games discs for a digital download, much easier to have all the games on the HDD and more space in my room. I only saw how much better is digital gaming is for me when I realized I was collecting paper and plastic cases. I also buy new, and I decided to wait for price drops. Much better than buying at high price then selling them at low price.
At the start of this year I began to collecting games but that end up quick because I did not see the point. The exception are games in a steelcase/tin. They really are pretty, or, like the Uncharted 3 "book/diary" case.
I also would like to add that full games are always more cheap on PS3 than on GoD 360 here (DIRT3 and Alice comes to mind)
For the OP:
Bayonetta, Tales of Vesperia, RE4 HD and the Bioshock series get my vote.