The Dell Inspiron is the computer I used at my very first job and I'll always associate with "starting out" in adult life.
Indeed, the Dell Inspiron is a decent, cheap computer designed purely for light-to-medium office work, and thus it doesn't need to be particularly exciting. In fact, the less distracting the better. It has a "don't look at me, get back to work" aura about it.
Once you outgrow it, you'll desire something more. The following cases might fit your bill...