It's a fairly modern laptop, so I don't think the capacity would be a problem. The speed, however, will affect both heating and power usage, so if either of those was annoying you before then going to 7200rpm might push it over the edge.
As for other parts, laptops generally aren't designed to be upgradable apart from possibly adding bits (like more RAM, or a wireless or bluetooth module if one was originally an option but not installed).
To use an upgrade to Vista Ultimate (either a retail Upgrade kit or the Windows Anytime Upgrade thing), you'll need to have Home Premium installed first. Have a chat to Sony and see how they suggest you get Windows back on your laptop.
Safe computing is a habit, not a toolkit.
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