Some good game soundtracks to get?

Here you go:
Portal 2
Deponia, one from best game beginnings
My personal favorite - Still Alive from Mirror's Edge

Mass Effect series.

To The Moon OST is all you'll need. Jamestown isn't bad either.

Trine 2, Deus Ex: Human Revolution, Mirror's Edge, Splinter Cell - Double Agent

Bastion
Guilty Gear, BlazBlue, Contra Hard Corps
Super Mario Galaxy
Double Dragon Neon, Mighty Switch Force, FX4
Muramasa The Demon Blade
Okami
Beyond Good & Evil
Gran Turismo games
Bionic Commado Rearmed
Music from Danny Baranowsky
Dynasty Warriors
Silent Hill 2
VVVVVV
The World Ends With You
Marvel vs Capcom