Dire Straits and Procol Harum - Newly acquired old favourites

There was a 2 for £10 sale going on at HMV yesterday and I went ga-ga over the choices in front of me. Was thinking of having my 'music for driving' selection updated - enough of unrequited-love-themed Indonesian songs for now. Was thinking of buying someone something as well.
After much contemplation and debate (Slash vs Iron Maiden? Bee Gees vs Metallica? Pet Shop Boys vs Black  Sabbath?), I settled on 4 CDs and a box set of Queen. Got myself:

•  Procol Harum: Now and Then, The Best of - I've always loved 'A Whiter Shade of Pale' by Annie Lennox, and equally loved the original Procol Harum version. Time to get myself familiar with their other works
• Guns and Roses: Greatest Hits - I remember wanting this CD when it first came out possibly 8 years ago, but never get around buying it
• Led Zeppelin: Mothership - another compilation, and the album comes with 2 CDs. I've heard so much about this famous band but I'm not familiar with their songs except for 'Stairway for Heaven'. Bought this album for that someone, but am having second thoughts of keeping it for myself heheh...
• Private Investigations: The Best of Dire Straits & Mark Knopfler - another greatest hits compilation, another band I've heard so much about but works I'm not familiar with. Also intended for someone else, but surprisingly this is my favourite among the four! (Queen not included). Definitely keeping this one for myself :)

What next? Black Sabbath (for the Iron Man track) and UB40, perhaps?