Makes sense. I haven't used Windows in almost a decade at this point, but I do plan on running Parallels with any new machine, so it's good you mentioned the issues with Windows 10. Would you recommend Windows 8.1 then?
I did originally have parallels on this MBP, but eventually jettisoned it in favour of more disk space. With some of my current work requiring Windows-only programs, however, I'll be going back to parallels whether I get a new system or not.
To be honest, a lot of the privacy issues that go along with Windows 10 have migrated to 7 and 8.1 via updates. If you've not heard about them, read up on it. Most of it can be turned off, but not all, and it's just the principal of it. I've only used 10 on a VM for testing, so I can't really comment on it. I'd say if you're just going to run a VM of Windows for programs that won't run native on OS X, I'd pick 7 or 8.1 with automatic updates turned off.