[stylist] question about how to phrase some words

[Vejas]

Hi all,
I have a question about a story I am writing, which is due 
tomorrow.  I would like to use the following sentence: "Arabic is 
a whole other language for me to learn, but I think I can do it." 
I'd like to know whether it's "whole other" or "whole nother?" 
When I talk I often use whole nother but it just doesn't sound 
right.  Can anyone help me out?
Thanks,
Vejas