is there a astonishing x-men skin pack of some sort, in other words the x-men's modern costumes
If you mean their bianchi costumes, then no. If you mean Whedon's Astonishing X-men, then yes... a few. Specifically, one by AA and one by C6.
C6's Astonishing X-men pack: http://www.mediafire.com/download.php?nkzdmlgjmzv
Enjoy.
I did Cyclops Torn arc costume, I think it's on Hero Force. I'll be doing some more Cyclops soon.