Imaging

I have always heard that monitors image and disappear better than floorstanding speakers.Is this absolutly true.
If not,what floor standers offer the same transparency as monitors?I have an Aragon 8008BB dual mono amp,Presence Audio dual mono tube amp,Rega Planet 2000 cd player,Cardas Twinlink speaker cables,Audioquest Coral interconnects and finally the weakest link-a pair of 10 year old Mirage 360 monitors.I am in the market for speakers and am open to any good recommendations.I would like to stay under 2.5k.
Thanks,johnny7