I also recently gave up on XP (trading platform and other programs no longer supported) and bought a very, VERY cheap Win10 laptop. Like you, I disabled everything possible (per BlackViper's recommendations) and just for good measure I keep no personal files on it, but rather on a thumb drive I plug in when I need those files -- not sure if that helps prevent snooping or not, but makes me feel safer, LOL. Considered switching to an Apple but hate to begin a new learning curve. Win10 laptop w/the docking station works fine so far.
Like you, I recently dumped all my old computers: an AT from 1986 w/daisywheel printer, a Sony Win95 and a Sony WinXP, all still working. Took out the HDs first. . . Still have an XP machine I built plus an XP laptop and now this Win10 laptop. . .