Used 1-2 yr old 650 GC or new M3

I asked the same question in M3 forum and of course I get 90% response for M3 and all the reasons why. But to be fair I wanted to ask 6 series forum and see what response I would get. I will be coming off a tune 335 with basically all upgrades possible minus upgraded turbos. I'm not sure if I want to do any more tuning on next vehicle, maybe some cosmetic only. So I would like a vehicle that runs well stock. I don't track and I need 4 doors. I thought about 1-2 year old M5 but reviews aren't great so I am hesitant. Any thoughts? I like them all and my budget is $65-$75k.