I don't know that you get more vintage correct with any of these tuners. Don't forget to add the T-450.
Tuner, MSRP, Year
T-400, 300, 1981
T-450, 400, 1981
T-115, 500, 1981
I haven't read good things about any Luxman tuners except the T-110 and T-117. But then they made a number of them that haven't been discussed except in a magazine review, if that.
I might lean toward the T-450 with acculock and it being a better tuner than the T-400. The T-115, I wanted one for my L-580 but read it wasn't so hot whereas my L-580 was and has suffered from that. So I'm very content with a pair of the T-110s, one pristine for the C-1000 and the other bought right and sounding great, a hallmark of the T-110.
Any of them you find would probably be fine in your area. I get plenty of stations here. The T-115 sure does look nice with the extra color of the red indicator and aqua glowing numbers. The 400/450 aren't especially great looking but they aren't bad and all three are correct for the pre/power/eq, C-,M-, G-120a units.