As above, i want a 60gig version, as ive heard the 40 isnt backwards compatible with the PS2, is this true?

Ive been fookin' everywhere today for one, my local Currys, Comet, Argos, Toys R Us etc havent got the 60, some have the 40, but im fooked if im replacing all my PS2 games if i cant play them on the PS3!

Soo, anyone got any ideas?