So you're not looking for a bag that swings back and forth quickly in order to help you train slips and evasions, you're looking for a heavy-bag type of arrangement?
In that case, Ringside's Bodysnatcher bag is awesome. It weighs about 65-70 pounds, and is shaped exactly like what you pointed out. It allows you to work the body, uppercuts, as well as straight punches. It also swings a little more than a really heavy bag, so it makes you get up out of the cement and work your footwork, which I like. We have one at our gym, and it's one of my favorite bags due to the diversity of skills you can train on it.
And it's still quite a bit less expensive than the bags on your link.
I was confused because a maize bag here in the States is a very small (smaller than an average speed bag) bag hung from a short chain so that it swings quickly at head level. It's used for practicing slipping, bobbing, ducking, and weaving, usually while shadowboxing right beneath the bag. Tyson used them religiously early in his career, and that's kind of what brought them into the public consciousness.
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