Sorry, a bit off topic, but I had to respond to KLUNKDM:
I agree with you 100% on COD4 - How great is that game? I got COD5 when it was released and it was back in the box a week later. I am still playing 4 (and, I might add, truly demoralizing people) after all this time.
I have an A950 and there is no lag. I'm sure that the technology in the B750 is equal to this. Besides, so long as the difference is in milliseconds, you will not be able to tell the difference. The human eye (and correspondingly, any hand reaction) can only move so fast. Think about it -- who can tell the difference between 3ms and 13 ms? Unless you can see the beating of a fly's wing you cannot tell the difference. Most of the lag that you will experience is not the TV but your internet connection. (Some estimates show that internet lag can be as high as 100 ms).
In addition to COD4 (360 and PS3), I play Killzone 2 (PS3), Left 4 Dead (360), GTA IV (360) and RE5 (360) and they all play wonderfully. Gorgeously. Ridiculously clear. I am sure the B750 handles it just as well. So, my advice? Get the TV and get rid of the dial up modem.