SATA 3 and USB 3 conflict

Hiya - long time reader, first time poster..

I'm putting together a new system and HAD chosen this MB.

ASUS P7P55D-E LX LGA 1156 Intel P55 SATA 6Gb/s USB 3.0

However, according to some reviews there are limitations on the use of Sata3, and usb3.

Here's a C&P of the review:
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The big limiting factor is, if you decide you want to use USB 3.0 or Sata 6.0 you have to do the IO Power Up which limits the bandwidth on the PCIe x16 slot to x8.

In addition, from the sounds of it, you can only use one of the special features. USB 3.0 or Sata 6, can't use both at the same time. Otherwise they will operate at Sata 3.0 or USB 2.0.
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If this is correct, can you folks suggest a MB that does not have this limitation?

I'm not a big gamer and I don't see myself needing crossfire, but  

Thanks