The biggest problem with package computers are IMO not the price, but the total imbalance of its components. "Game setup" usually has big bellybutton CPU, but so little RAM even Pacman will lag. Most often its the RAM that they strip away to get more numbers on the more visible (does not equal usable) performance additives. Not to mention you wont get to pick a right monitor for your needs, there is whole lot of other important attributes than how many inches is the screen size.
If you do only Excel and Word on your computer, buy a Dell or whatever.
If you like to play games that do not look like Excel and Word, there is only one option to get good bang for the buck, build your own setup. Almost all part shops will put the parts together for you (highly recommended these days, fragile componets), sometimes free of charge.