What ever you do don't get 'em from Planet X if you go with the Trail king, I got a couple and the beads were faulty on them both. which is pretty much the story of my life with Planet X - usable but never as good as you hoped.
I was going to order from bike-discount.de but actually only the cross and mountain kings are in stock in 2.8
This might mean I go for 2.6 which is still a fairly hefty tyre right
2.6 or 2.8 for jumps/trails. No real distance riding
and which of the 3 for mix of sandy hills and welsh mud?
Trail king looks like it'll deal with mud the best.
This is for a year round tyre
and the contis because they're about the only plus tyre for 20 quid each