If you had nearly unlimited funds to design a home, what amenities would it include? That's a question Manny A. Varas watches his ultrawealthy clients answer day in and day out. The master builder and developer at the Miami-based construction company MV Group is known as "the Billionaire's Builder" for helping celebrities and CEOs like Jennifer Lopez and Giorgio Armani create the home of their dreams. Varas is currently building roughly 15 homes in the $50 to $100 million range, and said about