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Any external HDD will do what you want, particularly with the right software (until Vista provides this next year).
If you ever want to have more than one PC share a hard drive simultaneously, then NAS is a killer concept. If you will never have more than one PC to backup, or if the data doesn't have to be visible to more than one PC at a time NAS is probably overkill. However, its very well priced overkill!
Generally external hard drives cost about $100 more than internal ones. So an internal one in a NAS is about the same price as the external one via firewire or USB2. Either USB2/firewire or NAS for 300 GB will cost you say $260 to $290. With NAS you simply need a free network card or a hub or switch or router and you just plug it in and you are done. Check with the supplier.
For me I would advise a NAS if you ever want your storage device to be available to more than 1 PC at a time (and a multi bay NAS is very upgradeable). By the sound of it this device doesn't have to be mobile unless there is a fire. In a fire you switch the NAS off, unhook it and carry your terrabytes of games, data, taxes files, images etc away under one arm.
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