If you are looking for a High Quality monitor in the $300 - $400 range, I'd personally recommend the Asus VS278Q. I would also recommend sticking with the 1920 x 1080 resolution. What do you plan on using your computer for? For general use, any kind of monitor would do, preferably 19 - 24", for gaming you might want to look at a 24 - 27" monitor.
Here are some links to my personal favorite 'cheap' 27" monitor:
If you are looking for a High Quality monitor in the $300 - $400 range, I'd personally recommend the Asus VS278Q. I would also recommend sticking with the 1920 x 1080 resolution. What do you plan on using your computer for? For general use, any kind of monitor would do, preferably 19 - 24", for gaming you might want to look at a 24 - 27" monitor.
Here are some links to my personal favorite 'cheap' 27" monitor: