I am currently mixing and matching.  I own about twenty or so 360 games, and have not fully explored about a third of them. Starting from summer just past, I have been going through old games, whilst picking up a couple I'd missed during a few of year's out of playing. These have been Halo 3, Gears of War 2, and Eternal Sonata, maybe a few others. For Xmas I got Ghostbusters, so I've been thoroughly enjoying that, and for my upcoming birthday I think I'm getting The Saboteur from my dearest. 
I'm looking forward to Final Fantasy XIII, Gears of War 3 much much later in the year, and probably Halo Reach, if that shows up. I also still want to pick up Halo ODST and maybe Batman Arkham Asylum, after all the great press on here. It's a beautiful mix of old and new.