One, that case pwns! I love the X-Navigator case. But, it should come with a 500Watt PSU! That PSU is plenty! Get that Case! It has 5 system fans as well!
About the video card. This is AGP, so I will give you the best option right now from both nVidia and ATi ok? Your choice. Links below!
This is a Radeon 9800Pro from MCI. It is right on the verge of $200, and iis a fairly decent card. Its clock rates are slow!
This is an XFX card that has good reviews, and is very fast, plus is bit cheaper! I'd go nVidia here, the 5900Ultra pwns!