While I agree with Tom's answer in general it really comes down to YOUR preference and what you're trying to accomplish. It's all about what YOU like not what others prefer. For pure performance reasons, definitely the 87s. If you want your X to be different, and you're willing to compromise on other things like performance, then those are nice wheels.

For example, I love 87s and may switch to them in the future and use my M reps as winter wheels. However, I just love the M style wheels too much to switch right now.

Don't sweat it too much. You're X will look great, whatever decision YOU make.