Panhard Bar
 

Whats the difference between the adjustable and double adjustable? Is it worth the extra $50? I will be putting c5 wheels on my car shortly so I figured I needed to go from non adjustable to adjustable.

double adjustable will allow you to adjust the bar while its bolted to the car. I would recommend it, its what i did, it makes things faster when you are centering the rear, though the other will work just as well.
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Mflb Instructions

I have single adjustable, its not a real hassle, but im lazy so i wish i went double adjustable :p

Single here. It's not something you are going to change often, I say put the $50 elsewhere.

im very indecisive, i change my right height quite often....:-?
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Mercedes-benz axor history

I agree. I think the main advantage to the DA is having two rod ends therefore a more direct connection and less potential for bind, not so much the convienence of adjustablitly.

I have SA PHB.....if that matters.

well how often are you goign to adjust? i mean shouldnt it be more of a once or twice use thing?