960bf or 940B

Hi Im new :D.Sorry for the long post but I need to know.

I recently purchased a SamSung 960BF from futureshop. I came home and set it up, everything looked fine until I started to game. There was a horrible ghosting effect playing games. I called up SamSung and they told me it shouldnt be doing that. So later in the day I returned it and got another one. The new one I got is alot better it doesnt ghost as much butI still see it (Playing CS 1.6). Now Ive read reviews that the 940B doesnt ghost at all, so I was wondering why the 960BF would, its the exact same thing except that the 960BF has a 4 ms instead of the 940B's 8 ms. So should the 960BF be ghosting at all or did I get stuck with another defective monitor? Im planning on going out tonight for another exchange. I would return the 960BF and get a 940B but Im afraid that where I would buy a 940B they wouldnt take it back and I got a 60$ discount on the 960BF. Is it just bad luck or is it a bad monitor.

Thanks
Abius][