I think you can buy a set of stock shocks off someone here or pinwall for pretty cheap and try it out. Its not like youre cutting the frame, they can be changed back. Besides if youre lowering your bike youre not exactly looking for the best ride anyway.

Ian I think those lowering brackets dont allow alot of travel either with the way it changes the angle do you think? And if youre lowering it a decent bit you wouldnt want travel anyway right?...Travel means rubbing tires...like on wendys bike right?

Of course this all depends on how much you want to lower the rear. But usually those blocks bring the rear down a decent amount.