I've come across a few danmotos, it really has to do with your budget. The Dan moto is close to a junk dean without a chin faring mount, and sounds close to the same. The big down fall of the danmoto is the lower case "H" design, but when the pipe starts to loss it's packing, you switch the two pipes.
oh and also the springs suck ass.
Now my honest option is to only buy a buell exhaust that is welded together not riveted or banded together. This is because the vtwins exhaust just takes a beating, and on the buell especially since its under the bike and exhaust leaks suck.
The d&d is your best bet for all around plug, play and forget about it. It also sounds the best in my option, more like a harley and what I run on my bikes.