All Z87 based boards will have AT LEAST 6 SATA ports as that is what comes native to the chipset.The OP said he wanted 8-10 so the Z87X-OC is out (has only 6).
I lke Opty's choice above better than a board made for EXTREME overclocking personally. No need to spend $200 on a board when easily a $140 board will be just fine.
Also a note, all motherboards will add more voltage than needed when set to auto. I also do not understand what you mean by 'oc stability is a feature with the extra power slots' either... If you are talking the 4 pin power, that only needs to be plugged in when using extreme cooling methods. I was up to 5.1Ghz and did not use it. You will see my review on the front page soon...