i havent bought one yet but i was looking at 2 diffrent routes on a front end theres this site that has a triple tree for a cb750 and i was wondeirng if could use that on my 650 and use the 41mm harley forks http://www.lowridersbysummers.com/parts/index.htm
Not to sound like a dick, but what's the got to do with a springer front end?
Seriously, you can spend $500 on a DNA springer, ebay is full of them. $800-$1,100 will get you a Donnie Smith repop girder. $2,000 + will get you a Harman (Executive Choppers), Spartan Frameworks or other top notch kind.
BTW what are you building?