The monitor Aphala suggested is a lot more than the others, and unless you have a great PC to push new games way above 60FPS, you don't really need a 120Hz/144Hz monitor. Out of the two you were looking at I would go with the ASUS. But if you are looking for a great budget 23" monitor, I highly recommend this monitor:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824009483
I used to scoff at Acer, but after using that monitor I really love that monitor, great colors, viewing angles, and contrast for its price range. Only thing to consider is that it doesn't have VESA mounting holes, but the bezel is really small and would be great for multi-monitor setups on a desk. It is also glossy, but if you can deal with a bit of glare(almost non-existent when on), you get to enjoy the complete lack of distortion that comes with heavy anti-glare coatings. So you get the cleanest image possible. This monitor's screen is so close to the glass the glare nearly goes away entirely while powered on. I highly recommend it if it suits your needs.