Looking for a really good rear end for my car 12 bolt

[mazspeed]

I just had my 10 bolt built up, and now I'm thinking about changing it out for a better unit. Price is not really an issue, but I wanted a nicer 4 link design, and a very good rearend capable of handling 700hp. I'm not looking for a 9 inch rear. Just a very very good 12 bolt design. Where should I look?

Thanks
Mike