If you are going to watch a lot of movies, yes surrounds are important. Not as important as say the front 3 and a sub, but you don't want to miss the surround sound involvement/envelopement. Me I am more into music, I have Dynaudio speakers up front, but I use some cheaper Mission speakers for surrounds. Eventually I'll get Dyns in the back, but when it makes sense.
Dynaudio Focus 260s, Focus 210C, DM 2/6, Hsu VTF3 MK5 HP, Oppo BDP-103, NaimUniti 2, Naim Stageline N, Pro-ject 2xperience Classic, Marantz SR7007, 60" 4K Samsung LED LCD