Orange Alpine 160? I ended up buying an ex demo, but was going to go frame only. Asking around I managed to get a frame and the upgraded float x and a custom colour for £1800. I imagine you could get a frame for £1600, maybe less, if you were happy going with the monarch and a standard colour…
GT Sanction was the other contender (already mentioned). Tweeks have a medium for £1274, but that may be too small.
Suppose you could also consider an Orange Five, which are less than the alpine.
If it helps at all, I also have a 150mm aggro hardtail, and bought the alpine to be able to do all day / big rides as well as uplifts. So far its managed all that just fine.