Looking for a new hamster cage. What's good?

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Hey all. I really want to buy my sister a hew habitat for her hamster, since her birthday's coming up on April 10. We currently have three Hartz cages, connected, and some Hartz tubing (since we haven't found another brand that fits with Hartz), but my sister's hamster is relentlessly trying to pull a Houdini, and I think even if she wasn't always trying to get out, the tubes might fall apart anyway. The whole thing is just very frustrating. we bought some extra tubing yesterday for her cage, and in under an hour, she was wriggling out of the tube where another piece had fallen off. So, I'm trying to find some reliable, high-quality cage and tubing brands. I've also been thinking about building a custom cage for my sister. The only thing is, I'm no carpenter (thankfully, my father's pretty handy in that medium), and I'm very worried about the security of the structure and any doors that would be on it. Also, I worry about providing proper ventilation, etc. You know. Basically, I worry about everything. So I'm really looking for advice in both or either of these areas. What's a good brand of cages and tubes, or how should I go about building my sister a fantabulous habitat for her deviant hammy? Helps! O_O