Yep, it's hard and dangerous if you have absolutly no clue what you're doing. If you study up and be real careful, it'll be all worth it. So if you're new to computer building, don't try it yet. If you're pretty experienced, it would be a nice thing to learn.
The Antec Truepower is a legendary PSU for being high end and affordable but if you want the cable sleeving and a little bit more of a kick go with the Enermax.
Raptor is only for people who hate loading times. I really hated having my slow *** computer struggle with booting photoshop and half life 2 so I got the raptor and cut down my times in half. You should probably try a WD or seagate 200 gb sata first then get a raptor if you feel it isn't fast enough.
I figured you wouldn't want to mess with GPU overclocking so I found one that was already overclock ^^
Case: Thermaltech Tsunami
CPU: AMD Athlon 64 Processor 2800+
Mobo: DFI LanParty UT nf3 250gb
Memory: 1 gb G.Skill PC3200
HD: 74gb WD Raptor/120gb WD Caviar/500gb WD Caviar
GPU: NVIDIA GeForce 6800 GS/XT