I agree with what Vince is saying. You are getting yourself into a situation where you have to ask yourself what you can live with and what you can live without. You will be able to get by without a good soundstage and imaging if the sound is smooth from top to bottom. To get smooth bass from a floor standing speaker next to the wall nearly requires that you have adjustable bass output. I think you would be happier along the upgrade path with getting a good LCR setup and using a subwoofer to dial-in the bass. I think the Thiel MCS1 would do the trick. I use it as my center channel and am impressed with it. SGHT also really liked them. They are musical, work well with different placements, have good directionality, and won't give you bass problems. Just a thought.
Good luck!
Gregg
Good luck!
Gregg