Like to spark up a discussion:
Allston tough to beat for sheer variety. With Super88, Yi Soon, Carlos, Russian Markets, and many others in the mix.
Chinatown, for all around wonderfullness.
North End, with the bakeries to boot, nuf said.
Even my own local local Coolidge Square in Watertown.
Confession: I don't make it to Dorchester often enough for Vietnamese, Jamaican, 'cue, etc.
Various neighborhoods in Somerville, Brookline, Jamaica Plain also deserve props.
Curious to hear what other hounds plug as their favorite geographic region for all around deliciousity.