Shall we give OP a chance to respond and, maybe, refine the question?
Thats not how we play "flamewar" over here!!
And yeah, my vote goes to KDE. All those gnome fanboys ... I don't know how you bear it .. konqueror > firefox , kmail is better than thunderbird
AMAROK ... there is nothing quite like it .. if you haven't used amarok start now!
and the other vote : ..... Kate for me too ..