Reply to Questions concerning laptops for DJing and production

So I've been looking around at MacBook Pros for myself to get around Christmas time and I kinda wanted to ask for help on the specs

Would it be worth it to add the upgrade from 2.3GHz to 2.6GHz for use with production and DJing or is it unnecessary?

Also, would 4GB or RAM suffice or is the upgrade to 8GB of RAM worth it?