I’ve got a 2016 Whyte 901 and it serves exactly the purpose that you are looking for.
I’t’s evolved into something a fair bit burlier than the stock build (Pikes, wider bars, dropper, 30mm rims etc), but even before that it was a right laugh on singletrack/techy stuff.
It’s comfy on long hacks, stable on the downs, yet it will happily launch off everything, and has got me out of a lot of trouble (that it also got me into).
My only issue with it is the rear tyre clearance is rubbish (which is accentuated by unnecessarily wide rims). The 17/18 models are far better in this respect though (they’re plus friendly IIRC)
£200 SH should get you a really nice one 🙂 The 90x frames from a certain year are all basically the same except for a few details like seat clamp. I think they 17 onwards dropped front mech support so got more clearance through that as well, and went boost at some point.
Out of the other frames mentioned, I’d eliminate some for the following reasons:
– Parkwood – High TT, short reach, a bit old school in geo.
– Meta HT – Notoriously harsh