CPUs, RAM, hard drives, modems, and video cards are all markedly cheaper than they were a year or two ago.
Memory modules are the current example of choice.
The exception to the ever-cheaper trend is the monitor. Even if you don't want to re-size your display, this article may prove helpful because it's likely you haven't explored all the ways you can get your desktop looking just right. You can change the setting in one of two ways. The most obvious is to choose a different zoom percentage from the menu. The less obvious, but way more fun, method is to grab part of the ruler with your mouse and drag it to a different size.