My friend who is a huge Whedon fan told me that I should check out Astonishing X-Men. It was my first foray into Marvel comics (besides that trade of Eternals I got because of Gaiman), and after reading the first trade I ordered them all. Damn enablers.
Maybe it's because I didn't really know anything about Kitty or Piotr or the X-Men beyond what I half remembered from the movies added to the fact that I'm not a huge Whedon fan and therefore don't know his work that well, but I enjoyed this run (especially Logan's regression into a wee 19th century lad). I got to love Kitty and Piotr, and then got my heart broken for Piotr as she merged with a giant space bullet in a moment of wtfery and heroics.
I'm now going back and rereading some of Kitty and Piotr's (though not necessarily together) earlier stories. Any suggestions from Ellis' run that show her as more mature? I'm interested to see the difference.