My two points still remain.
First, the iPod Classic and Zune are both based on previous MP3 player generation technology which has been around for years, or only months for the Zune. The iPod Touch is the next generation. The click-wheel design will most certainly fade away.
Second, yes, storage size is important but it depends upon the individual which only underscores my point that it's all subjective. It all depends on what's important to you. For some, 16GB is plenty of space while others need 160GB.