You've got some very nice snowdrops there, Kristina, and the basis of an excellent collection. I'd say some of them are special; certainly not things you'd find in the average garden. Comet's a superb snowdrop, and so is Mrs McNamara. The most sought-after and rarest aren't always the best garden plants, in fact often quite the opposite. What you want to start with is exactly what you have from South Hayes, a solid collection of good reliable garden snowdrops that will (mostly) increase steadily and make a good show.
It'd be interesting at some point to see a complete list of what you have. The very rarest and most sought after snowdrops from South Hayes were deliberately shared out amongst experienced growers who would be sure to keep them going and spread them around. But I'll bet what you have would be considered a very desirable collection by many on this forum.