Can you help me rate these Mazurkas?

[flyinfingers]

Hi,  I wish to learn a Chopin Mazurka.  There are four in this book.  My teacher told me to pick one of them.  Can you rate them for me in terms of difficulty?  
Thanks!

Op. 67 No. 2
Op. 67 No. 4
Op. 67 No. 3
Op. 7 No. 2

Or, if you have any suggestions for others, that would be great!  It will take me awhile to learn them, so I have to love it, obviously!