It's really a question of your budget -- if you can afford the MacBook Pro, go for it!
Video editing is pretty hardware-intensive, so you won't go wrong with a faster processor and more RAM, not to mention the additional harddrive space (which gets used up fast if you plan to shoot in HD).
The non-Pro MacBook is still a solid machine, though, so if that's all you can afford, I'm sure you'll be happy with it. You might also want to consider using Bootcamp to create a Windows partition (XP SP2 or Vista are supported); it's great to have the best of both worlds!
And yeah, when it comes to avoiding malware, there's no substitute for safe computing habits. Despite having two Windows boxes and one Mac at home, I've never had a computer virus infection. Just make sure you have anti-virus software installed, keep the definitions up to date, install the latest security patches for your OS, and periodically check your PC for spyware.
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