Dynamic Speakers to match Luxman L-509X

First of all......HAPPY NEW YEAR TO ALL!

My question or the advice is which speakers would sound good with Luxman L-509X Integrated amplifier. I am listening all kind of music on the modest levels but lets say the electronic music with a lots of bass is my forte. I just had a chance to audition PSB Synchrony T600 but the sound wasn't right meaning that the sound was forward with the extensive highs probably because of the titanium tweeters. My room is 4 meters x 7 meters x 2.5 meters ceiling and the speakers would be placed along the long wall. Of course I would treat the room and for that I would also need suggestions.

Please excuse my English and thank you in advance on suggestions and advice.