Thanks guys for all the great info.
I ended up with the B & W DM602 S3's. I was just too impatient to wait for used. I was without my open system and it was driving me crazy. But now that I'm back to listening I plan to take my time and start auditioning more speakers. If I find something I fall in love with I'll just have these be my surround speakers.
Oh and by the way, I now have a Bose Acoustimass AM-15 system that will soon be up for sale. I first have to send in the sub/power unit to Bose for repair and then I'll be selling it, probably e-bay. But, if you know anyone who might be interested in the system I can let it go for less than they are selling on e-bay (used) and the sub/base unit will be redone and Bose gives it a complete checkup along with a one-year warranty (I'm unsure if this is transferable). I have two Bose stands as well. In all honesty going from this to the B & W's is like night and day as far as the two channel listening is concerned. The Bose is definately listenable, as I'm sure you're all aware, but in 2-channel mode it is nothing compared to the B & W's and I'm sure the other speakers that were suggested. However, it makes a nice quick and economically surround system.
The salesman told me that the B & W's would take about a month to break in and would start sounding better and bring out more bass. When I first heard them I thought "if they only sound better over the next month, I'm in good shape." At first I thought the bass was a little too lacking but now after three days of quite a bit of listening they do seem like the bass is getting better. Maybe it's all in my head though. Plus, I'm still messing with placement.
One last thing. For Sony STR-DA300ES owners. I haven't pushed the volume level past -20dB, per the salesman rec. and they don't seem as loud as I expected. Is this normal? I thought at a 150W per channel it would be shaking the walls. I haven't given them full power but it doesn't seem like they will be as loud as I expected. I was planning on adding a power-amp but wanted to wait on that purchase for awhile. Don't get wrong, they get loud (with a very clear sound) but it just doesn't seem like they will get REAL loud.