Those 6 7200RPM drives will be able to saturate your 1Gbps link and will even give your 10 gig link a pretty decent workout. Remember, when working with RAID, you’re dealing with multiple IO, so you can take throughput of one of those drives and multiply it by six, and that’s effectively what you’re going have available. I would personally recommend using a good set of SAS drives, over SATA, to maximize your bandwidth server side.