Guinness! For a "treat" s l o w l y pour it into a half filled glass of any good draft beer and enjoy a "black and tan". Would you pass the cheese and crackers please!
Mackesons is nice too! A British co-worker introduced me to that one, Joe said it is prescribed to folks who are lethargic... lots of B vitamins.
Also, if you have the time and patience... brew your own. Start with a "kit" and personalize it with more hops, barley... maybe some molassas.
Mike