I'm a former 52" B750 owner and I can emphatically state that it is by far one of the best LCD's on the market even when taking LED LD sets into account. The LG may be a nice TV but if you read between the lines in CNet's review, you can clearly tell they favor the B750 (even for blacks in some cases).
However, if you are willing to spend up to $2100, I would move up to a Pioneer KRP-500M plasma display. That is what I currently own and it blows the 52" B750 I had out of the water. None of the LD LED sets can touch this thing in picture quality, including the famed XBR8 and A950. It has near perfect blacks, perfect screen uniformity, no off angle viewing problems, much much better motion handling than the B750 and FAR less input lag (important for gaming). The only downside is that it's not quite as bright as the B750 out of the box BUT if you apply the ControlCal patch and run it in ISF-Day mode, it can achieve >50 ftl brightness which is very bright. Some people complained of DSE (dirty screen effect) with 9G Kuros but this 500M has none at all. Furthermore, the buzzing is inaudible to me.
You will need to purchase a separate stand for the TV (typical cost is $50-$60, I have a spare available for sale if you decide to go this route) and if you do not already have a receiver + speakers, you will need to purchase speakers separately (I'm using Kuro 111FD speakers). Those two things drive up the cost a bit but not by much. Lastly, the TV is limited to two HDMI inputs but again, that is only a problem if you don't have a receiver or require the use of more than 2 inputs. Overall, even with the added expense, the KRP-500M is probably the best TV you can buy on the market right now.