As for basic monitors and stuff, try to get one with either build in speakers or with a speaker unit being able to attach underneath it. Dell has it for most of their monitors. Itäs just a very handy way of saving table space and dust collectors. As long as you don't have a huge stereo or are extremely picky with your music, those built in/attach beneth speakers will do just fine and will also help to not clutter your desktop/workspace.
And about size, well you know, bigger is always better.
