A couple of things:
The one piece top clamp will help a whole lot with bars getting tweaked due to less than stellar support of the oem bushings.
The high durometer bushings mentioned (let alone the aluminium (sic) ones) certainly do have a price as Skipro said. Too high a price for me! I took mine out in the middle of a ride 'cuz I couldn't stand the KTM buzz!! Hey! If I want my arms to be numb within ten minutes I'll just buy the orange package! (Mostly kidding. I've ridden a 200ex/c a good bit. It's a great (buzz-buzz) bike!)
You don't need to spend gazillions of $$ on bars, imo. Without the one-piece clamp the oem bars and a couple other sets of bars didn't last long. With the one piece clamp (from jay seavey/JCV) I've run the same set of Renthals for a couple of years. They haven't not bent 'cuz they haven't been whacked neither! (count the negatives)
Re: loosening the clamps
That has never been a problem with the conventional forks on my kdx. It is always a problem on USD stuff for reasons I don't understand. USD clamps generally have a larger bearing surface and are tightened to about the same spec. Still, I've seen a few bikes (different brands, different forks) that look like a DNA strand after a relatively light hit.
A Scotts makes a big difference. For one, it won't likely fit under a straight crossbar. For two, the loose pedestal bushings on the kdx tends to misalign the damper-to-post joint...and that will kill your damper in short order if you don't pay attention!
OK...I guess that's more than a couple...........;)