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corrado33, what you want is a decent steel road bike frame from the early 70's, which you build up to your specifications.
I suggest you forget about hub brakes. Rim brakes are just so much easier to deal with.
Look at the IGH shifter options; comparatively few fit on a 23.8 mm bar (which is standard for drop bars). Sturmey Archer makes a good 5 speed hub that comes with a bar end shifter; and there are aftermarket options for some others. But most IGH shifters fit on a 22.2 mm bar, which is standard for "upright" style bars but also some older steel drop bars. Soma makes a "Lauterwasser" shape bar that's 22.2 mm and works well with IGH shifters. That's what I have on my commuter.
Good suggestions.
You might be happy with mounting the shifter on an accessory mount. The mount clamps to the handlebar, next to the stem. Here is one with a bike computer attached to it.
