Get a small, lightweight aluminum baseball bat. For defense purposes, you'll have a much faster swing, won't get it stuck in people, and it'll deflect edges, conceal well, carry easily, and brain pretty much anyone without serious headgear.
If you like the idea of a machete, I'd get a khukuri. It's a great, big utilitarian machete. Its primary advantage is in the shape of the blade; it's heavy at the end, and curved to take advantage of a natural swing. The curve relies on your natural reaction to slow down slightly right before you hit something with a swung object. The curved blade gets to your target slightly before you subconsciously start to "pull" your blow, taking advantage of your (nearly) full power. The shape, combined with the club-like balance, makes for superior hacking. Furthermore, it's big and intimidating, and legal for you.
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