Bookshelf Speakers with the decent bass

"Or, should I try Floor standing speakers. Thank you in advance on yours opinions.
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I think a floor standing speaker would be a much better way to go. See if you can audition a pair of Vansersteen Model 1's. They're very easy to drive and the bass is in a different league than what you have now. If for some reason, you don't like them, listen to some Monitor Audio floor standers. The silver series is very nice. That said, the Model 1's are hard to beat. You should like them.

For your size room and the type of music you like the Harbeth P3ESR should be on your list. The Spendor 3/5 r2 is a close second. I have owned both and think they are both outstanding.
http://www.hifizine.com/2011/12/harbeth-p3esr/

In that size room I think towers would be the way to go. The Monitor Audio Silver series Zd542 mentioned are very good. I had an extended listening session with the Silver 8 about a month ago. I could live with that speaker. Great bass, open full mids and good highs.

I also recommend the Bowers and Wilkins 683S2. I've demoed them several times over the past few months. Great speaker! They have the same great attributes as the MA Silver 8. I prefered the the tweeter of the B&Ws just a bit more.

I demoed both the MA and B&W with Maratnz gear with 80-110 watts on them.

Users and reviewers speak well of "The Clue."

I've had Paradigm reference Active 40's vs in Cherry veneer. Very good stand monitors with dual 6.25" drivers with 125watts to the two mid/bass drivers and 50 watts to the tweeter in each speaker. I ran no sub and the bass these speakers it out sounded like I had a 12 subwoofer. I wish they still made them today in the sig line they would be a keeper speaker.