I have tried and grown lots of different varieties and the most resistand to blight with me are DUNLUCE for very earlies and SANTE for main crop.
I get my seed from Dundry Nurseries , they sell from a single tuber to what ever weight you so desire, in this way I am able to try lots of varieties very cheaply, though some are a total waste of time and effort as they are tasteless.
It is difficult to escape blight, some years I get some other years there are no blighted tubers!
As for Sapro Mira I got them when they first came out at first and cost a fortune, good crop, no blight, but terrible taste, totally uneatable, so I had to dump them!
In the gardening section in the Telegraph last Autumn they published results of selected potato trials they had conducted, and two of their favourites were Sapro Mira and Rocket, me I would not take either if I got them for nothing!
So in the end, it's all down to personal choice and taste!