Oh - more yarn!

My loving mother sent me a present.  This pattern and yarn kit:

I know, I needed more yarn, right?  It was surprise gift yarn so it doesn't add to my stash.  I was contemplating buying it though. 

 Right after I finished the Black, Yellow and Red sweater that I started.  I have managed two pattern sets on the sleeves and the body.  So far I think it's turning out well.  

Of course now the trouble is, do I cast on the new one or make myself wait?