I am about to buy the new Young Justice Blu-ray and I'm stuck on whether or not I should get rid of the DVD copies of these episodes I already have, and that got me wondering. If you upgrade a DVD to Blu, do you still keep your DVD? Given how many movies are released in Blu-ray/DVD combo packs, I tend to usually keep my older DVDs and just put them in the same case as the Blu if I can. I'm just not sure if I'll ever need to revisit those older DVDs again. What do you do?