advice on a KZ550

I've posted this elsewhere so I'll just paste the link:
kzrider.com/index.php?option=com_kunena&...w&id=224972&catid=10

One more thing I should ask is how much it costs to do a complete engine overhaul on one of these engines? I'm talking everything, crank, bearings, rods, pistons, rings, etc.
And are there any known frequent "issues" with the 550's?

Thanks again everyone!!!