Final Fantasy have loads of these types of albums, Piano arrangements, Black Mages, Distant Worlds ect.

Basically I just want to know what else is out there.

Orchestral Compilations I know of are:
Video Games Live
A Video Game Symphony: PLAY!
Greatest Video Game Music by London Philharmonic Orchestra

Excluding FF series I've got :
Banjo & Kazooie symphony
Steins Gate Symphonic Reunion

Then Cover artist such as:
Taylor Davis (Violin Covers)