http://www.youtube.com/watch?v=1KkPtiCjST0"Just One Second (APEX Remix)" by London Elektricity. The song was used in preview for Gran Turismo 5's Ferrari 458 italia model, and it suited it well.
Listen to this song in 720p with headphones or a good sound system. LOUD.
I listen to it every day after school, twice, and it relaxes me so much. Just the perfect balance between soft and rough in this song is just... indescribable.
Do me a favor and just listen to it, once. You will enjoy it, trust me.