Case/Power Supply Help

I'm going to upgrade my P4-1.3gig Dell Dimension 8100, and I need recommendations for a case and power supply. Here's what the specs will be after upgrading:

*P4-2.4 Gig (possibly 2.53 gig)
*Asus P4S8X Socket 478 DDR motherboard
*512MB PC2700 DDR RAM (possibly 1024MB)
*Radeon 9500 Pro video card
*60MB 7200RPM Hard Drive
*External 3.5" floppy, a DVD drive, and a CD-RW drive.
*3Com Network Card, an old SB Live! sound card

What case, and what wattage power supply should I get?

(Note: I'm not going to OC)

So your basically building a new PC? good. Dell's use propriatary mobo's and PSU's that cost LOTS to replace.

PSU wise i would go for a 350W unit from antec enermax or toptower. As for a case... how much do u want to spend?
Lianli, antec, enermax, atlas chieftec cases aregood, but costly.

anything relly that is well designed, looks decent, has lots of room inside and most importantly, good airflow!

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If you want to replace the PSU then you might have to replace the mohterboard too. Dell uses proprietary PSU and MB.