Hi FW, hope you are well.
I would certainly go for a Seagate. Indeed, I have ALL my pics and music on it and another for safety but be sure to partition it. Two partitions, say 40-50gb each, to start with will take care of Pics on one and music on the other - then backup to disc(s) as well. I say this for one reason only. I NEARLY lost all mine and its heartbreaking if there are favourites. I have nearly 13gb of music and some you can no longer get.
Be safe.
Btw, if you defrag once after your have installed them all it will probably be not necessary to it again.
Happy New Year
D