I'm looking to upgrade my HDD in my 2006 CD MacBook. I'm looking at either Seagate or Western Digital. Anything I should stay away from? I've heard 7200rpm is faster, but uses more battery than 5400rpm, but some posts say it doesn't. Has there been any definitive answer to this? And last question, what's the largest drive my MacBook will support. I currently have a 250 GB but it's getting pretty full. I was waiting on Lion to come out, but it doesn't look like it will support Core Duo so I'm just going to do it now. Also, SMART Utility is saying my drive is failing.