Well, a larger TB won't hurt your low end if your engine is built up to utilize the extra volume. The reason the TB kills your low end is because it will cause a loss in low-speed intake velocity. If you don't go too crazy with the size, you can have a bit of both worlds. Everything is a compromise.
CAI should not hurt low end at all. If it's well-designed, it will help at all power bands.
UDP doesn't add anything. It frees up power, though.
Larger plug wires don't do a damn thing on a stock ignition system. Period.
Just keep asking questions all around. To be honest, there are really not that many reliable sources for information relative to sources that are ...less than reliable.