Ways to say, when it comes to/where X concerned in Chinese?
What ways are there to say When it comes to something and Where something is concerned in Chinese? I looked it up and found what appear to be 3 main ways 在。。（方）面， 說到 and 当谈到, is there any difference in their usages? What other ways can you express these phrases?
For example the sentence I wrote 爲什麽總是好像，說到你，我們總是回到開始？Why does it always seem, when it comes to you, we always go back to the start? Is 說到你 correct here?