Help With Small Room Speaker Decisions.

Hey there. I’m looking to add some bass to my office system and I’m unsure how to approach it. Right now the system consists of Totem Rainmakers powered by a Primaluna Dialogue One which is fed by a Bluesound Node. Room is real small, just 9x11x8. I’m not looking for super low and powerful bass. Just enough to fill in the music and give some impact and dynamics. 
 

I’m going to upgrade the speakers soon, and my question revolves around the whole small speakers with subs or larger speaker no subs.  I like with subs that I could add DSP and such alleviating possible issues in such a small space. On the other hand I’m uncertain if a sub will cover the upper and mid bass as tunefully as say a pair of Harbeths with there 8in driver.  
 

If I go without subs a pair of Harbeth 30.1/2 are top of my list. I have a pair of C7es3 xd in the main system and love their bass response, mostly for the tunefulness. I think a pair of M30s could sound sublime in the space and they apparently are at their best near field.  If I get subs I may give the Totems a go with them for a while, or maybe P3esr, or who knows.   For subs I’m thinking a pair of Rel’s with either 8in or 10in driver. 
 

Curious to hear everyone’s thoughts and suggestions. Thanks in advance.