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I'm going of the fact that I used to have an ST205 Celica GT-Four, and the difference between having the raiser blocks in was massivly noticable, it took a bit off the top end (Though I did use this occasionally, from around 160mph down to about 145 Mph). It felt so much less twitchy at the back end when cornering at high speed
I would only get a OEM spoiler, unless you KNOW FOR CERTAIN that much R&D and testing has gone into the spoiler your looking at!
On the ST205 having the spoiler in the higher position, gave, iirc 60kg downforce on the rear axle @ 62mph (100kph) this was documented by Toyota/TTE/TRD when in development/production
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