Probably a Starling Murmur Trail, based on a bike having more appeal to me the more I can see myself still riding it in 8-10 years time or more. I know a Nicolai would be a better suspension system and maybe a better FS bike overall but a custom geometry and a really good shock on a steel single pivot appeals. It’s the only FS bike I’ve browsed online and thought about getting the £ together for anyway.
Actual dream FS bike would be one that had enough travel for the average trail without using a telescopic fork. All the fore-aft stiffness of a truss fork but smoothly suspended, no bushing slop and more winter-resistant – a girder fork that works and looks good in the way an old Norton or BSA motorbike does. The closest anyone got was the Girvin so it’s not looking hopeful but if we’re talking dream FS bikes that would be my project, matched to a frame similar to the Starling using an axle pivot like a Trek.