Depends on year. M3/5/6 can all be had for that, as can some Merc AMG's
Having been in "bored" mode myself recently, even though I have absolutely no time to drive any weekend car, there are a lot of cars out there that have depreciated a LOT and represent bargains at the moment. 650i was one I had pointed out to me, and they can be had for as little as £12k now, 6 years old with 60k on them.
I love the 650i, they look the business