It's pretty hard to buy a bad bike these days, at any level of travel. So many of them seem to work so well, have great specs and warranty support etc, that you could pretty much boil your choice down to what you particularly like the look of.
My own recommendation would be the bike I ride, obviously.
A Nicolai Helius AM. It is very neutral in its ride characteristic; it's not the plushest ride around, but it is the least obtrusive. By that I mean it has no strange quirks and behaviours in the way its suspension works.
I've spent time on both the Carbon Nomad and Ibis Mojo HD.
The Nomad works slightly better to isolate you from big inputs; the Mojo HD pedals better and both (in carbon guise) are 1lb lighter than the AM.
The Yeti 575 is light, well balanced and the suspension works very well, but it's a little less planted at speed than the Helius AM.
Having seen what an Orange Five/Alpine can do first hand and in the right hands, I cana also say there is something intrinsically right about those bikes.
The idea that a multi pivot/bearing bike isn't going to hold up as well in the Peak I think is nonsense. My AM has been all over the place and through equally as corrosive winters here in the SE as in the NW and apart from one service a year, it's pretty much faultless.
What I like most about the AM is its versatility.
You can set it to travel anywhere between 142mm and 172mm (it can go shorter, but I don't think it works at all well in that guise) and with prudence it can be built sub 30lbs.
Mine weighs 28lbs 11ozs with air front and rear. I also run it coil front and rear for the Alps and Peak/Welsh rides.
If you would like a test ride, I can offer you one on mine, depending on where you're located.