There's no doubt that the SLO 100 plugin model is 100% awesome. My favourite high-gain amp models from NDSP are the aforementioned SLO, Plini Rhythm and Lead, Nolly Rhythm and the QC Kraken. The Rabea X Kraken is great too, but I slightly prefer the QC model. At the moment, I spend most of my time on Plini Lead, but that changes constantly.