I think buying a hookah should be all about personal preference. The first real hookah I bought was because I loved how it looked, I had no idea about its performance at all. In that regard, I would advise you to look at the Hookah Reviews here on HookahPro. Just go to Forum>Product Reviews>Hookah Pipes. Because the quality of the hookah is what really matters, how well it hits, and also how long it will last. Here are a few sites you can check out:
Those are the one's I'd start with. Find a hookah you like on the web, and then see if there's a product review on it. If not, I'm sure if you ask around by just posting that hookah, someone will have insight about it's quality. Enjoy your hookah hunt man! If you have more questions, just post em, and like Sammniamii said, everyone will be glad to help out.