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I think just about any time you swap out your bars for someting different, your going to find yourself replacing something. Sometimes it might only be a brake line, you might have to just lengthen your wires. It's really going to depend on what bars you like, and how much different they are from the ones you have now. You might get lucky and only have to re-route some things. What kind of bars are you thinkin of?
I have a 91 FLHS, last spring I put 12 inch Z-bars on my bike and all I had to replace was the front brake line. I extended the handlebar wiring, and re-routed the clutch cable. The throttle cables were plenty long. All you can do is try.