Jesus guys, I've been at it for over a decade, dumped a ton of DVDs and deleted some digital copies, have maybe abt 4TB total. Selectivity is the key! Not all is golden. You'll be better off in the long run if you weed out the old and the bad.
I have a couple of 1TB> drives and they have worked pretty well. I stick with WD for the most part. I have a couple of non WD portables, too, and have had no problems or failures. Generally a quality drive is a quality drive unless you don't take care of them.