I realize that I'm the nOOb here but If you're open to a little advice from someone who works around bikes every day (when I'm not carrying a M-16 for Uncle Sam), go with the Big Dog. Custom bikes can be a nightmare if you actually ride them. Big Dog's been around for a little while now and have figured out how to make things work together. They're supposed to have a new motor from S&S soon. It's called the X-Wedge, 'wedge' for the combustion chamber shape. It's a big-inch VTwin of about 52 degrees with three (belt driven) cams instead of the two or four that HD uses. I'm sure they'll still offer the standard S&S clone motor they've used for a while as well.
All the best.
Ride safe.
Weazel
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