I like the abstract nature to this logo. Nicely done. It has a really nice contemporary feel, but I think it might be a little to "futuristic" for me. Maybe it's the choice of font? I'm not quit sure.
Upon further and more detailed review, we really like the font choice in #41. The abstract above it is nice too, but a little to abstract in relation to it actually representing the letters "S" & "R".
I have no idea if it's possible, but can you modify the abstract to look a little more like the original letters?