Wish I had seen this earlier, get the latest Tsunami case from ThermalTake.
Whatever AMD CPU you get make sure it is unlocked. Older AMD XP2500+ CPU's (within the 40 week of manufacturing) over amazingly, getting from 1.83GHz to 2.2GHz with stock HSF (Heatsink and Fan).
Get urself a nice ThermalTake Volcano Xaser HSF and overclock your CPU by upto 400MHz.
Whatever case you get make it Aluminium(UK)/Aluminum(US), it is a LOT lighter, it will also reduce chasis temperature by a few degrees C.
[size=0.5]Full Aluminium ThermalTake Case
AMD Athlon XP 3200+ *400 FSB* Barton (2.2GHz)
ThermalTake Volcano 11+ Xaser Edition Air Cooling
1024MB Corsair TwinX XMS 3200 (Dual Channel 2x512) 2-3-2-6
256Mb XFX 7800 GS EXTREME
2x WD Raptors (10krpm 8MB Cache) 36.7GB using RAID -0
Video Logic SonicXplosion 5.1 Soundcard[/size]