Did I say it would be Premier Cru? He wanted to spend 50 not £500!
In my experience, second & third growth Medoc chateaux produce remarkable wines at that price.
My favourite is Chateau Margaux. You should be able to pick up a bottle for £20; £50 will get you a fine wine.
A second choice would be a big, bold Italian Barolo, £50 will buy you a cracking vintage.