You're probably better off just reading some magazine reviews to make a selection.
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I don't think equipment reviews will help. I'm hoping to get the subjective opinion based on those here much more experienced with equipment arrangements and knowledgeable than me. I usually hate these kinds of questions, but this might make it a little more clean cut:
B&W 805 (maybe PM1) / Classe CAM-200 + B&W ASW10CM sub
B&W 804 / Classe CAM-200
For accuracy and imaging, which would you choose?
There's no reason I know of for not (and I could argue in favor of) going to a 3-way speaker and keeping the sub. The key point in either case is whether or not you're using bass management to take the bass load off the main speakers.
The sub will produce cleaner bass than the floor standing speaker and if you can place the sub appropriately it will provide a smoother bass response as well.