There are quite a few, but I would have to say for a new luxury sports car under $150k, the BMW M8 would be among one of the best since it combines luxury with performance.
According to BMW itself, on a BMW M8, the 0–60 MPH time is around 3.1 to 3.2 seconds. BMW usually is conservative on their 0–60 times so it is likely it could even be in the high 2-second range, which is faster than a Ferrari FF or Ferrari California.
So with performance nearly matching Ferraris and Lamborghinis for nearly half the price, the BMW M8 I would think would be the way to go.
600HP and 553Lb-ft of torque means this car is capable of competing with cars that cost north of $250k for sure. If the less-sophisticated BMW M850i could do 0–60 in the mid 3 second range, this M8 for sure should be able to achieve 3.0 seconds or less.
Overall, this is why I would choose the BMW M8 for a new luxury sports car under $150k.