Originally Posted by
Cooter
Build the best bike.
There are no parts supply issues. Don't put Sportster parts on any of them please. Every time a Buell part gets scarce some people panic that the sky is falling and buy all the ones they can find, most people do nothing until they actually need it and so far the aftermarket and worldwide enthusiasts have filled the small gaps very effectively.
Nothing wrong with the pre-'07 bikes and they'll run perfectly fine with the slightest attention and care.
The biggest change for the '08-up bikes was a better Fuel Injection system (better resolution and IAC, CPS), and also oiling/crank upgrades that resolved a very small amount of issues with the early ones.