The XB brake system, named ZTL (6-pot) or ZTL-2 (8-pot), is more than enough brake to stop a bike.
The Buell XB wheel is specifically designed and manufactured to hold the ZTL rotor. Many V-rod guys buy the Buell front end and install the forks, wheel, brakes, and other required bits. There have been several people who have welded ZTL rotor mounting points to other wheels but each one has been a custom job. There even was a company who made spoked wheels for the XB that accepted the ZTL braking system.
You can buy the Buell braking system new from a H-D dealer or EBR or used parts from any Buell XB. There are a couple aftermarket companies, Galfer and Braking, that offer wave ZTL rotors too.