I use a Dell Dimension 5150 at work and I have to say that I'm pretty impressed with it.

The computer is over 2 years old now and is used for 8 hours everyday, yet it's still running as though it was purchased only yesterday! I haven't experienced any slowdown on my system, everything is running just fine.

The system comes with a pretty nifty monitor which is just the right size to work with everyday, but it also good enough to watch movies on (in my opinion).

The keyboard is pretty weird, with nothing much surrounding the keys but this doesn't take much to get used to! The keyboard itself is pretty nice to use and typing on it is a joy.

The front of the tower houses 2 USB ports as well as microphone and speaker jacks.

When running, the machine is nice and quiet which is a real plus point of you've got several machines in a small office.