My top 5 favourite instrumentals in no particular order...

Metallica - Orion
Jason Becker - Perpetual Burn
Vinnie Moore - Defying Gravity
Joe Satriani - War (or a track from Strange Beautfull Music which I forget the title of)
Steve Vai - Tender Surrender

There are a lot more I could mention seeing as I almost exclusively listen to instrumental music.... but anyway, these are the ones that jump to mind at this moment