Your psu should be fine and you shouldn't need anything for power connections.
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www.coolermaster.com/pro ··· &id=2552You have 6 sata connectors on 2 different cable runs. Depending on where you put the drives there is always the chance that you will have to play around with getting everything to reach properly but you should have enough connectors.
You didn't specify whether the hard drives are ide or sata but either case should have enough power connectors.
As far as the data cables I would get enough extra for the number of drives you have and not worry about what is included with the board. It is always good to have a few data cables extra for troubleshooting etc. They don't cost much and there is nothing more annoying than having everything you need and finding a data cable might be faulty or you are one cable short.
At newegg they can be found under computer accessories -> cables or cables-round. If you are buying ide cables they come in different lengths up to 3' and 2 or 3 connectors(if you want to slave some drives you need the 3 connector type. Get ata 100 or 133 and, if you go really cheap be careful with the connectors as they won't hold up to abuse.
Since you have so many drives you need to consider where they are going to be placed and try to choose cable lengths that are appropriate. You don't want them to be too short but you don't want your case stuffed full of unnecessary cable length either.
It sounds as if you are wanting to set up a raid array, given the number of internal drives. You might want to consider if this is really necessary for your uses.
If you have further questions or want to check your choices post back.
