CL601 if you are aren't worried about age, H900XP if you are, if you can sacrifice a passenger LR60 would probably work (not too comfy with 8 pax, but then again the Sovereign / C750 is the only midsize that's comfy with 8 pax as it offers a 2x club 4 layout - though some don't have this so watch out).
An idea of budget would probably rule out some suggestions.