For the past several years, I've bought nothing but Seagate drives and they've been great... HOWEVER, Seagate's
desktop drives have been getting sorry reviews lately, so I'm a bit leery to recommend any Seagate. I've also had excellent luck with Western Digital drives.
Size is a question you have to answer yourself. How much space do you need? Have you used the 120GB yet? If not, why upgrade? Unless...
Speed is another question. 7200 RPM drives are faster (I have one in my white Macbook), but they often cause vibration (I can feel mine on the wrist rest and around the trackpad) and eat into battery life (I see basically no difference here). They're also more expensive. For most people 5400 RPM drives are fine, but if you want max performance, get a 7200 RPM.
Finally, have you upgraded (or plan to upgrade) the memory/RAM? The white Macbook only comes with 1GB standard (unless its the newest model) and that's just not enough for Leopard (barely enough for Tiger). I recommend maxing out the memory - depending on the model, it may be 2, 3, or 4GB. What are the other specs of the Macbook? You can check the max memory capacity on
www.everymac.com.
The white Macbooks are still great little computers - I love mine! The only thing I'd trade mine for is the new white one with the nVidia graphics.
