Why upright? If your home has more carpet than hard flooring, uprights pack the power you need to get dirt and debris out of even the deepest pile. Many include on-board specialty tools for hard-to-reach cleaning.
If you don't want to guess when it's time to change the bag, or pay for replacements, the bagless system lets you throw the dirt away every time you vacuum. A clear, easy-to-clean cup lets you see what you picked up before you dump it, and most models have a bottom-release cup that makes emptying clean and simple.