I would think that this placement with just the RS-1b's would be a much better overall arrangement than having both the RS-1b's and the RSIIb's in the system. Sometimes I have pics of multiple pairs of speakers standing together, but I certianly don't play two pairs together, to me it just doesn't make sense. Your placement, your room size seems like a pretty good arrangement in my mind. I bet they sound pretty good. I really like mine when playing arrangements that have a big sound, much more than simple arrangments with a solo instrumental or vocal passages where there are a lot of quite passages. Not that they are bad on those play list, but they just really show their true strength when you get the full Orchestra playing dramatic pieces. I really like a lot of different genres of music, classical is one, but I also like a lot of pop, rock, folk, and even some heavy metal. The heavy metal I like is that Finnish, Denmark, stuff with soprano's like the Gathering, Within Temptation, Serina, Nightwish, Leaving Eyes, and the RS-1b's really will present that with the impact that makes it very exciting to listen to. One a side note, they really sound great as a front pair in a Home theather setup, you hardly need any surrounds, and no Sub needed, they will handle action audio on your HT effortlessly!
I like to watch DVD's of good concerts, Within Temptations, Black Symphony is just great on the RS-1b's playing the audio with a big screen playing the Video. Another great one that I really like is LoreenA McKennitt's " Night from the Alhambra" if you ever get a chance get those two DVD's and watch them with the RS-1b's doing audio duty.