Have you considered the LS5? If you want more body, warmth, the LS5 is THE ARC line stage to do this. It has a 3-dimensionality, bloom and harmonic richness the LS15 can not touch. Look for a MK III as these have a more natural top-end than the MK II and the III also has a little more resolution which is very noticeable on vocals.
John
John