Here we have an awesome black BMW 535i E60 with some tuning. Now this "legendary" German sedan is quite affordable and still is fast and luxury. So it's a great base for your tuning project. If you can solve mechanical issues, you can buy even more powerful version with V8 in engine bay. BMW 545i E60 with tuning can be awesome like this one, but with cool exhaust system.

BMW E60 that was built in classic for BMW styling, black car, tinted black windows, lowering and bigger wheels. In the same moment, chrome trim was not blacked and it has some harmony with wheels. Rims have milled face. Looks not bad, but, on my personal opinion, it looks a little outdated. However, this BMW 535i E60 looks great with such tuning.