Don't get the Maxtor hard drive, they're crap and break easiliy, consider Seagate or Western Digital. 6800GS is better than a plain 6800 and costs about the same.
I'd have to agree, however there has been better success rates with teh SataII.
I would go with a Seagate.
If you want some better advice, post some links to where you plan to buy, we can rate with more depth with proper specs in front of us.