Good questions. I’m able to get the Bartok w hpa next week but the Rossini is at least 3 weeks for delivery. My dealer offers 100% of the Bartok price as credit when upgrading to Rossini. The benchmark amp isn’t something I want but it sounds like a reasonable option for the Rossini. If you have experience with other amps I’d like to hear your impressions. After a bit of research benchmark, headlamp gsx-2, spl, and head trip ii all appear to be strong options.
The built in hpa is excellent with my hd800 and wouldn’t buy a dedicated amp if I were to keep the Bartok.