I'm shit at these type of things as my list is likely to have changed by the time I click post.
10 mainstays easily available...
Arab Strap "The Week Never Starts Around Here". Perhaps not as accomplished as Philiphobia, but edges it IMO.
Aphex Twin "Drukqs". Perhaps not the MOst accessible of his albums, but the MOst rewarding..... and it's a double album
Badly Drawn Boy "The Hour of Bewilderbeast".
Bjork.... Can I suggest the recently released box set?
Bob Marley..... There's probably a compilation which covers all the essentials. Of the individual albums though... possibly Kaya.
DJ Shadow "Endtroducing" Better still, the Deluxe edition!
Dr Octagon "Dr Octagonecologyst"
Joanna Newsom "The Milk-Eyed Mender".
Lamb "Lamb" Their first and still their best.
Merz "Merz". EVERYONE should own this.
Nirvana "Unplugged in New York"
Radiohead "OK Computer"
Sigur Ros "Agaetis Byrjun"
Stone Roses "Stone Roses". Then again the best of might be better as you'll get Fools Gold too!
Tricky "Maxinquaye"
Ok, that's MOre than 10, but like the rest of you, I'm sure there's MOre!
Massive Attack, Delakota "one love", Chemical Bro's, Prodigy, mu-ziq, Squarepusher, Plastikman, Lou Reed, Aretha, Marvin, stevie.........
bleh.