Thank you to everyone for the replies.
With regards to the potential sensitive nature of these dogs, I was under the beleif that is was a trait shared by a lot of sight hound and lurcher breeds anyway so it's something I've given a lot of consideration to, I'm a fairly laid bac person any way so I can't see it being a problem.
I fancy a collie cross just because I've been told they are fairly easy to train and ideal for the first time owner, I'm not against other crosses, but thought this one would suit best.
I've seen a few lurchers work and the one I liked the most was a lurcher