Oh goodness, it seems like I have every size imagineable in bands now.  LOL  The ones I like to use the most are the medium size light weight for regular day to day and then the medium size medium weight band for shows. It seems as if the light weight are less damaging.
 
I order all of mine form laineeltd as welll.  
http://www.laineeltd.com/cgi-bin/lai...diumbands.html 
The band removal scissors are great too 
