Dartmoor Hornet is probably the cheapest brand new option at £185 from Slam69 bikes, it takes a tapered steerer, can be run with 26 or 27.5 wheels, is fairly light as its aluminium, takes a dropper post and will happily sit on 130mm forks.
But, in true STW style i’ll recommend my Ragley, the Piglet-2 is more trail orientated than the longer forked models in the Ragley range and will be perfect on a 130mm fork…bit heavy but you’ll never break it!…takes a 31.6 dropper, has a 44mm headtube for any shape steerer…and taking unfashionable 26 inch wheels means they can usually be found on eBay secondhand for sensible money…as mine was!…
….hand on heart its the best bike i’ve owned and in the last 5 years i’ve had a Kona Caldera, Saracen Ariel, On-One 456-evo, On-One 45650b and a Giant Trance 27.5….the Ragley just feels right and is a hoot to ride every time.