I would strongly urge everyone to stay away from ebay. I wrote a article about the reasons a while back which covers all the issues with ebay. I would also never even think about getting any rig from tobacco imports because they carry nothing but Chinese junk. In any case, if you plan on having a rig worth owning plan on spending no less then 70USD.
In terms of what to buy go for a Syrian from jandrhookahs.com, www.socialsmoke.com
. I can also recommend Khalil Mamoun rigs from www.pimpyourhookah.com
. Stick with something 26" or bigger.