Reply to New MBP, should I buy the one with the Retina screen?

I'll buy the machine primarily for DJing, but it will also be used browsing, reading mail, Photoshop and Indesign. My question is simply if I should buy the MBP with Retina, or without. Will it make any difference at all when using Tractor?

Do you use MacBook Pro for DJ? Do you have the Retina option?