If this is the first pc you bild, I should tell you to get some good thermal past for the CPU like Arctic silver 5.
Don't mind with the RAID. I don't think it will increase performance as much as buying 2GB ram or a better gfx-card.
Im using that ECS C19 right now and I have to say its very friendly so good for a first build About the only complaint I have about it is that the BIOS options are set up kinda confusing I mean it has all the options but they seem to be organized in a weird way (but hey who spends much time there anyway?) A good machine that will serve you well !
Pentium D 805
2 x pqi turbo 240-pin 1G ddr2 667 in dual channel
Thermaltake Armor Series VA8000BWS (thing is a monster btw)
ECS C19-A SLI
COOLER MASTER eXtreme Power 600W Power Supply
XFX Geforce 7600GT
2 x WDC SE16 250GB 7200 RPM 16MB Cache SATA
nvidia dual tuner MCE
Got it to reach 3.8 stable on air, but I'm keeping it under 3.4 to keep the voltage around 1.28
35 idle, 42 load: the thermaltake combo works really well; the rear 120 sits right in front of the Typhoon. I'm not sure I'll venture into water cooling anymore as I am quite comfy with these temps.
Overall, a stable and cool 3.33 dual core for $120. It was my first build, took me about 4 hours, and came close to costing me under $1000 w/ rebates.