I'm about to embark on a reseller package, with HSphere (H-Sphere) and SiteStudio (Site Studio) -- doing that, by the way, so searches are more accurate! -- I've narrowed my search down to less than 5 and, of those, these are my favorites. Not much feedback on either here... and what there is for Hostica is mitigated by a seemingly geniune response/explanation for their problems of 12/24 months ago.

Anyone play around with reseller accounts with these guys?

Keepin' it search-friendly: Radical Vision, RadicalVision