Looking around, the best translation is probably this one: http://en.wikipedia.org/wiki/The_Koran_Interpreted

There's a version that the Saudi government gives away free, but several different sites said that it was a politically slanted version, so I think I'd rather read a scholarly-minded version instead.

http://www.amazon.com/Koran-Interpreted-Translation-J-Arberry/dp/0684825074 It's not too terribly expensive, at least.