So my bulbs gone on my w1070 and rather then investing in a new bulb again which is similarly priced to the projector itself now, I may as well just get a new projector. It'd be nice to get a 4k one as well just so it's somewhat future proofed.
Done some research and from what I can see the best options seems to be between the Optoma UHD550X and Benq W1700. The Optoma seems a lot better in terms of noise level but seems kind of high in terms of input lag. The Benq seems to be potentially noisy (the avforums review points this out as a con) and although I'm used to the noise with the Benq W1070, it'd be nice to be a bit lower. That said the input lag seems far better then the Optoma. So I'm sort of stuck between which of the two is better :/ Unless there's another great projector I'm ignoring.