Help me build a poker computer.

[David04]

I am very sorry, I am sure that this topic has been done around 1,000 times since the inception of this forum. But, I will do it again. I am looking for a computer that can:
Run poker programs(Party, PT, GT+, etc.)
Store a large amount of music/movies.
4 table with no overlap(I do not want a 2001FP, too expensive at the moment)
Other basic things(e-mail, internet usage, etc.)

I need wireless internet, and I would like a video card with the ability to add a second monitor, should I want to in the future. Other than that, nothing very specific.

I would prefer to NOT build my own PC, but if it will be signifigantly cheaper, than I would be willing to undertake this small project.

As cheap as possible, please(preferably sub-$1k.)