Well you certainly are facing some imaging problems with those above speakers aren't you.
I don't know what these speakers cost that are mentioned here and don't know your budget but you could all but eliminate that sub and the amp by getting a pair of Powered Mackie monitors.I have the one with 8 inch woofer(HR824) but they also have one that is a 6" woofer design as well (HR624).The HR824 is a studio monitor and due to the passive rear 12"oval woofer the monitor is able to reach down to 20HZ.The bass is never boomy and these speakers sound very nice to me and are used in many studios.I picked mine up used for $900 and the HR624's could probably be had for around $600 a pair used or so i am guessing.I also watch alot of DVD's at my computer with the 20" LCD and i feel like i am at a tiny theater due to the great sound.I also have dead center imaging going on however which is a biggie probably but still they sound fantastic to these ears.
I don't know what these speakers cost that are mentioned here and don't know your budget but you could all but eliminate that sub and the amp by getting a pair of Powered Mackie monitors.I have the one with 8 inch woofer(HR824) but they also have one that is a 6" woofer design as well (HR624).The HR824 is a studio monitor and due to the passive rear 12"oval woofer the monitor is able to reach down to 20HZ.The bass is never boomy and these speakers sound very nice to me and are used in many studios.I picked mine up used for $900 and the HR624's could probably be had for around $600 a pair used or so i am guessing.I also watch alot of DVD's at my computer with the 20" LCD and i feel like i am at a tiny theater due to the great sound.I also have dead center imaging going on however which is a biggie probably but still they sound fantastic to these ears.