I buy the Guardian.
Of all the papers it seems to me to be the only one with a conscience, and it's design is superb. It clearly has it's faults, but as the old maxim goes: don't believe everything you read in the papers.
It's paper sports coverage as a whole isn't the best (that'd be Times for football and Telegraph for cricket) but it's investigative sports journalism is second to none, David Conn is especially good, and it's website superb.