I too owned and loved the LSi15s for quite some time. I now own the Boston Acoustics E-100 and love them but if I were looking for something that would take all of the strengths of the 15s and improve upon them now I would get the Goldenear Triton 2s.
http://hometheaterreview.com/goldenear-technology-triton-two-loudspeaker-reviewed/
http://hometheaterreview.com/goldenear-technology-triton-two-loudspeaker-reviewed/