piaa help

[Big.Z.hummin]

so i guess after extensive research i could find my answers but i thought it would just be faster to get yalls opinion.

I'm looking to get some piaa's for my gobi but am torn between the plain ole 520's the 520 ATPs and the 580's. i have already ordered a set of 550's(8 in) for my brushguard that have the ion crystal lense... so what i cant decide on is whether to get the 520's because the ion crystal lenses would match or go 580's for more light output. is there a huge advantage in the 580's? also i'm trying to decide whether to put a set of driving and a set of fog on top or all 4 be driving? any input would be greatly appreciated!