Ive got a ractive strut bar on my gen 3 that I installed before the car was lowered and I can honestly say it made a difference... I was surprised. Thanks for the heads up on rubbing, Ill have to rock some boro duct tape over the lining of the hood...
As for the whiteline rear sway bar, all i can say is

mmm mmm gooood!
oversteer is simply the rear of the car wanting to turn more than the front... the whiteline rear bar will give you more of this, as opposed to understeer- which is a good thing. It allows the big chunky front wheel drive camry to pivot through the corner more easily, thus improving your handling.
but you cant really go wrong with an ebay strut bar- so cheap, might as well.