I've grown Setanta a couple of times, decent crop of potatoes (don't remember about slugs) and good flavour but a little on the floury side for me, but I like waxy types so probably not too floury for others. I didn't find them particularly blight resistant here.
Blue Belle, I think a lovely potato. I've grown it the last few years, looks gorgeous, decent size tubers for baking and good all round potato. Not bothered by slugs this year, good crop with some very huge tubers. I'll grow this again next year.