hmjgriffon
Known around here
I don't know if there is a difference in quality. Probably, yes, but I've always been able to scratch my PTZ itch with Dahua cams sold by forum members on ebay. So I've never bought a no-name PTZ that cost more than about $150. (and those are pretty terrible)
On the bright side, you can get a 3 or 4 year SquareTrade warranty for just about any camera purchased on ebay.
Maybe you should ask forum member @milkisbad for his product catalog: http://www.ipcamtalk.com/showthread.php?257-Good-source-to-buy-Hikvision-items-at
Last I checked his Hikvision PTZ prices were pretty unbeatable.
I really have the PTZ itch, but I would like to get a few more stationary cams first and then when I feel like my coverage is pretty good, I want to get a PTZ. I think the PTZ will mostly be just for fun to be nosy and spy around on the neighborhood unless I log onto it while something is going down, then I may be able to use that zoom to get some good evidence. What is the current best sweet spot for PTZ's, if there is one? Like how the 3mp hikvisions are the current sweet spot for fixed cameras. I am not beholden to hikvision by any means, though I am happy enough with the 2 I own that I have a 3rd on it's way from China as we speak.