I picked up this monitor recently - ASUS VE258Q - 25 inch for $230 I think on sale.
I upgraded from a Samsung 20 inch 5 year old monitor and it was like night and day difference.
The colors are so vivid, everytime I look at my screen I am in love...games just look awesome. I cannot believe I waited this long to get a bigger screen.
The biggest problem I ran into with shopping for monitors a lot of it is subjective and going based on other reviews, and problem is with so many monitors out there not like you can just go to a Best Buy and look to see how you like it. It took me a few weeks to decide it but glad I did and the price is perfect.