If your battery life is really that low, amonkie, it just means you need to replace the battery. I have a MacBook 13" that's about a year and a half old and I still get 3-4 hours on a full charge without breaking a sweat. Watching movies or streaming video I get at least an hour and a half.
Certainly that's not going to compete with the staggering 7 hours of the newer models, but you can and should expect far more than 30 minutes to an hour, even with a bit older machine. Frankly, though, there are precious few times when you really need it to be more than four. If you can afford the new stuff, no reason not to pick it up, but if price is a concern, I think you'll probably be quite happy with a slightly older model.
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