Guiness for most things.
Dos Equis (dark) with Mexican (presuming it's REALLY SPICY - as Mexican should be). Yummy.
Hmmm....I tend to do other Porters and Stouts at the local brewpubs (ALL the local brewpubs - there are FOUR in town! Granted, only 2 of them really export their brews in quantity.)
Ambers are okay in a pinch - I think Amberbock is about all of the 'mainstream' beers I like. MGDs, Buds, etc - all very bleh. They taste too watered-down.
(How many beer threads have we had, now, though? When do we start talking about OTHER alcohols? Now, gimme a Grand Marnier for instance....or 12....)