A Sony Trinitron monitor is a very good one.. I picked mine up at bestbuy for 300 about a year ago.. and it's the best I've had.. btw you should be willing to put a little more into a monitor, as it normally will stay with you through at least 2 computers if not more..
KDS monitors are good as well.. and you may be able to find them at the price you are looking for..
I'm going to assume you are looking at a CRT monitor as well. as LCD screens are not good for gaming.. to much shadowing lag.. LCD are good for text, but anything with allot of motion you are going to get ghosts on the screen..
As for LG I didn't know they made monitors.. but I know they make very good cell phones.. one of the best for clarity.. I had a LG 550, that was better then my Samsung camera phone for I have now.. but I kind of dropped the LG one to many times..
edit..
here is a kds at newegg for under 200.. it's a flat screen crt 19
http://www.newegg.com/app/viewProduc...155-032&depa=1