EASER  For $10, I want the ability to modify the font and font size. I'd also like to be able to set some controls, such as hot keys for repeat functions and such. Perhaps I'm not properly seeing these features in the screenshot, but it looks to me to be too basic for the price. Currently, I use QuickTunes, which is free.  
(Version 3.0.1)

LE_72  I use BravoTunes, it provides the same features and it's free.  
(Version 3.0)

KARENHIGGINS  great little APP. This little non-scrolling APP makes life so much easier. And for only $5 it's a good price for what it does.   
(Version 3.0)

ANOTHERSCOTT  DockBlock also does this (though you wouldn't guess from its name), and its half the price. Plus it also does its main function of allowing you to disable the dock (it provides its own app switching menu).  
(Version 2.0)

COLOURGRAVITY  This is exactly what I've been looking for for ages: a simple, non-scrolling way of showing the title and artist of the current track in the menu bar without any unnecessary additional bells and whistles.

To make this my perfect app, I'd like to have the ability to alter the separating character (currently a dot) between track title and artist name, and I'd like it if the app opened and closed automatically when iTunes opens and closes (although I get around that at the moment using iKey to achieve the same thing).

Even as it is, though, TunesBar is an app I wouldn't be without.  
(Version 2.0)