Great thread title. I want to start one asking which cardigan and handbag to go for!
Seriously though, For me (personally), a buff is the worst thing you can run in. If you're hot and sweaty under the buff, you have to remove it completely... and then you're cold. It is either on, or it's off. No half measures.
I'd just get a running top with a high neck that can be zipped/unzipped/half-zipped. Or a running jacket that does the same.
Thanks everyone for your replies! I purchased my buff yesterday, going to give it a go. I do tend to get too hot while running, so end up taking my jacket off even in winter! It's the cold air making it hard to breathe that's the issue...fingers crossed it works!