Can't believe no one has mentioned Reflex yet, it's the classic!!.. went there like a million times as a student & the only time i ever saw trouble was once, and it involved me.. and it was 50% my fault anyway!

But i think the Triangle, and especially Illusions as Blanca says is one of the best & probably the nicest area to be generally.. as a kind of loose rule, the higher up the massive hill (park street onto triangle, onto whiteladies etc) the more nice & upmarket the bars become.. i quite enjoy it up there for a similar reason, the odds are good i can kick back and not have to worry about too much trouble usually.