I think those Statement monitors are going to be hard to beat. The main question is, do you have the ability/skill/knowledge to construct a crossover? Do you have measurement equipment? If not, then I would go for a proven design that someone else has already built. That way you can just clone it.
If you know a thing or two about building crossovers, and if you are interested in a totally new design, then that would be awesome! You could always go active, but even that requires quite a bit of crossover skill in order to do it right,
Have you decided on a budget for the drivers? I like the Fountek neo3.0cd that is used in the Statements, or if you want to step it up a notch, you could go with a high end tweeter and mid-range drivers from the likes of ScanSpeak, or some other high end component manufacture.
I am looking forward to seeing your ideas and concepts come to life!