I think if you use the search finction at the top right corner you will find many tyre threads (I would use the America spelling for the most results) that will offer opinions for the rear.
The 18" front is less common on the 750, but I think you will find options.
What kind of bike are you setting up? Cafe, tracker, bobber, mostly stock? The look and performance you are going for will have a big influence on what recommendations you will get.