Initially I decided to purchase Rokit KRK 6" Gen 3 studio monitors bc they extend down to 38hz. I figured I'd get a better bass response, better sound, and better monitoring in the 40 to 60hz range with these (I normally roll of below 40hz anyway).
This all changed when I went to my local music shop today. I was told that what I should be doing is keeping my 5"s and buying a sub instead (the salesman seemed quite insistent that this was the right course to take). I understand that I'll get a better representation of the low end with a sub. However, I've heard this can introduce more problems then remedies when it comes to at home mixing. Please let me know your thoughts and if I should stick to the original plan (KRK Rokit 6"s) or go in for the Sub woofer.
**Also, because I know you're probably going to ask about my room... I have a large rectangle-shaped room with a high-sloped vaulted ceiling. I'll get the dimensions for you guys soon. Thanks again for any help
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^^^My desk is on this wall (right below the painting

^^opposing view
Again, I'll get the dimensions soon as pictures can be deceiving.
EDIT: Dimensions are 25 X 14" .