Tri X is indeed a favorite - sentimental or not and it will remain my primary film for as long as it is available. Probably because I know this film inside out and can "see" what it will do with a specific scene.
However, if I want super fine grain (for a 400 film) and remarkably good tones - I would go for the New Tmax 2-400.
Not as forgiving as Tri X, but more so than its predecessor, Tmax 400. This is the film that you wanted a rheostat on the sun to balance shadows and high lights! In a studio, with controlled lights it is very good, but out there in the messy Mother nature - forget it. Either the shadows are solid black and some faint details in the highlights - or, more often the case, some decent shadow detail and solemnly fried highlights.
Unfortunately, the local Kodak importer ( i think he also does Zippo lighters!) has jacked up the price to almost $7/roll.