I would spend the money if I knew what was on the other side was so incredible. My other thought is to buy the TC Kline and skip the rear bar and camber plates because that might just be a killer setup for the street. I have purchased some expensive suspension components for my motorcycle in the past and it was a case of you get what you pay for.
Have you seen or have any information on the Dinan springs? They have only a slight drop, I'm not sure how the handle or what the spring rates are, I could possible put them with a set of konis