I’d recommend what I did:
I bought a tufty road bike type thing with big clearances and discs and mounts for guards and racks. I didn’t need a tourer, a cx bike, a road bike, a singlespeed, monstercross or anything else really, but I quite wanted all of them. Now got a bike that does a decent job of the lot without much more than a change of tyres.
Done over 12,500 miles on it. Given the choice of which bike to take to Finland for 3 months, it was a non-decision. Has served me well 6 weeks in on road rides, commutes, mtb trails, bike packing trips, and cx racing.
I managed to get my Peregrine under £1,000 through a combination of a flexible bike shop, flexible frame producer, parts bin and on-one special offers.
If I was looking for a complete bike today, I’d be looking at the croix de fer, Day One, Arkose.