Aside: I wasn't aware that there was a problem with this type of thread in the Hardware talk forum. The traffic is low enough for there to be room for both this and architecture discussions, IMO. I mention this because I saw you refer to a B3D thread on this elsewhere and was surprised when I didn't see it there.
To the topic, I have some thoughts related to the decisions I made in building my new system...your choices should work pretty well, but maybe some alternatives will open up some possibilities for you:
I assume from your CPU, cooler, and RAM choices that you are going for serious overclocking. Otherwise, with the quality of your components, a cheaper P4 with overclocked FSB would work pretty well (I'm running a 2.4 @ 3.0 right now with now heat issues, and I'm using an Antec Sonata with 1 case fan, and have a SATA RAID Raptor setup with an additional Maxtor 7200 RPM 200 MB EIDE drive).
Regarding CPU/RAM choices:
cooler - I considered the funky "radial pin" design for a while, but went with a Zalman CNPS7000 instead. At full fan speed, it is still pretty quiet, and I'm getting similar or better cooling results than those reported in the feedback for the one you chose (80 F ambient, 34 C case, 38/41 C CPU idle/FAH...I'm also assuming the hyperthreading CPU usage figures are illusionary wrt to the amount of load the CPU is under for maximum thermal output). NOTE: I recommend using Arcticsilver "Ceramique", whatever your choice.
RAM - I bought the TWINX1024-3200LLPT...unless there is some sort of quality sacrificing scam going on (doesn't seem to be, it is working well at 250 MHz so far), this seems a better deal. Newegg pricing has it cheaper than two 512 MB sticks, and there is "testing" for dual channel usage. I recommend you look for that, unless someone here recommends against it for some reason.
Regarding storage:
I purchased an Asus P4P800 Deluxe, but your choice is just plain better from what I can see. Assuming price is no object (seems a safe bet), my recommendation is to reconsider your tradeoffs.
I didn't find confirmation that it could support more than 2 drives in RAID configuration. In any case, I'd advise changing two of those Raptors to 7200 RPM SATA drive(s)...if the SATA channels can be assigned independently for two different RAID arrays, two Maxtor drives configured as a second RAID array. Of course, you have the possibility of IDE RAID as an alternative that should be as suitable, though I'm not sure about throughput limitations of of the implementation.
I think your current storage figure is a bit low for the cost, is all. Certainly not slow, though...I'm happy with my 2x WD Raptor SATA RAID so far.
I also recommend a DVD R/RW swiss army drive.
Regarding PSU:
Yep, I'm pretty sure cost is a distant second to quality for ya.
If it isn't too noisy, and if I'm correct in presuming a relative disinterest in cost, I guess there isn't much reason not go "overboard" as you are. Maybe you could get only two SATA raptors, get 2 IDE drives for IDE RAID, then wait for 15000 RPM SATA drives to come out...leeway is a good thing.
Have you considered PC Power and Cooling, though?
No comment on the LCD, etc...that's between you and your wallet. I will throw in a
for the heck of it, though.
...
Your system doesn't look like it will be very quiet...maybe you should look into some dampening materials to help that out. I'm guessing (without researching the Enermax unit) the PSU fans will be loudest component, but this solution should help with the case fan mounting positions and hard drives.