OP only wants to play Android emulators, and I have to honestly say at least for Blue Stacks that it plays nicer with Intel machines. I get frame drops at home, where as at work I don't really. All we need to do is replace his core platform.
This is what I would do if you're not interested in anything else. Use SLOBS and NVNEC (new) and CPU cores won't be an issue.
What specific games do you plan to play, and what hardware options does Nox have these days? I can use up to 8 cores in Bluestacks but it doesn't make much of a difference over 4 or 6.