Which breed?

I just decided to investigate the breed of my cat...she is a mutt, as far as we know, because we got her from my grandma and she has no idea who her parents are.
   
Some basic descriptions to go along with the pictures:
   
Black, white, and really furry.
   
Super affectionate, but not a lap cat. Always up for chin scratches and a lot of petting.
   
Green eyes.
   
Very good with babies and other people.
   
Really long tail that is kinda brown/black.
   
Ok, these are some pics I found real quick for the purpose of this question...
   
http://sites.google.com/site/porgeypics/
   
Any advice that you may have would be most beneficial!!

I can't help you on the breed but that is the coolest looking cat that I have ever seen.

Yeah, shes a cool cat :) Shes a crack-up too...she has this frog doll that she takes around the house and molests while moaning. It's just ridiculous.
   
It doesn't really matter what breed she is in the long run, we'll still keep her. It's just a curious minds kinda thing.