help me with my [gaming] computer build please!

My budget = $1500
Build type = not planning on upgrading, need a build that will last for 2+ years without upgrades
What will the machine be used for? = primarily, a gaming rig. should be able to flawlessly run spore and world of warcraft on high settings as well as (some) of the more graphically intensive games out there on medium to high settings. rig should double as a graphic design workstation. This means photoshop work mostly... no CPU-intensive video compositing or anything like that. However, monitor needs to be very accurate with color and also rig should (obviously) include a higher end graphics card.

Features the build should include:
1. Processor
3+ ghz or equivalent
pretty much every processor is dual core now, so it must be dual or better (quad would be nice)

2. GRAPHICS CARD
Higher end card
512 MB+ memory???
DirectX 10.1 and OpenGL 2.0 compatible???

3. RAM
??? I'm assuming 2 GB DDR2 ram as a bare minimum but am hoping for better

4. SOUND CARD
no idea. I want a sound card, not integrated sound.

5. HARD DRIVE
I don't need a huge drive. 100 GB is more than enough for me.

6. MEDIA
7200+ rpm CD and DVD player.
(I do NOT need the ability to burn CDs or DVDs since I have a second computer, so this feature would just be a "nice to have" budget permitting).

7. CASE
??? no freaking idea

8. POWER SUPPLY
??? no freaking idea. How many watts is enough?

9. MONITOR
Large monitor
good refresh rate

10. SPEAKERS
(No speaker system needed! I will re-use my existing 5.1 surround sound speaker system!)

11. MOUSE
(No mouse needed! I will re-use my existing ones which are still good)

12. KEYBOARD
A keyboard will be required. Something ergodynamic, perhaps with some advanced functionality. Must be comfortable as I will be spending a LOT of time using the machine. Prefer corded rather than cordless!

13. OS
Windows XP or Vista??? If Vista, what version of Vista???

WHAT I AM LOOKING FOR:
One of you technically savvy people to suggest the parts for me to buy so my dad can assemble it. I am SUPER concerned about all of the parts being fully compatible with one another.

Thank you in advance for your advice...

The Wolfdales are the processors to go with right now, they run very cool and have great performance. Plus you can overclock them quite high without too much effort.
If you don't need SLI I think the Intel P45 chipset motherboards are a good buy, but let someone else recommend one.
The new ATI Radeon 4850 has awesome performance and is really cheap. (Check this for some good reading) In short, it kills the previous generation cards and is right up there with the 9800 GTX and sometimes even beats the new GTX 260. It's also relatively cheap
Get at least 4GB of RAM, it's cheap and you'll be able to do a lot more. DDR2 of course; DDR3 is still way more expensive and doesn't have much of a performance gain.
Your money will be very well spent on a Corsair power supply, either the modular HX series or the non-modular TX series. Any one of them will provide great power for your computer. These supplies are highly regarded throughout the industry for their performance and as a bonus they're really quiet. Despite what some people will tell you, you don't need ridiculously high powered power supplies like 750+ watts. Especially since the Wolfdale processors are very power efficient.
Sound cards are somewhat unnecessary these days, since onboard audio has caught up to them. But if you go with Vista (which I think you should) the Creative drivers are supposedly crap. Not sure about that though.
Pick up a Seagate 7200.10 or Western Digital Caviar SE WD1600AAJS, either one should be fine.
Any DVD burner that uses a SATA connection should be OK, you can find some of the top ranked ones on Newegg. Besides, burners are so cheap (under $30) that there's no reason not to have one.
A 22" wide monitor is a good balance between price and size. Since you're looking for something with good color, you'll want a monitor with an IPS or PVA panel. Check out some of the ones from Dell, they have good monitors and have coupons and deals most of the time.
Case is personal preference. You'll want something at least $50 to ensure you get something with good quality.
Vista Home Premium is the version to get. It's got all of the features you want at a good price, since Ultimate is pretty pointless. 64-bit is good if you get 4+ GB of RAM. if you've got any special devices, make sure they have drivers available.
But just letting you know, 2 years is a long time in the computer biz. My computer is about 2 1/2 years old and can't even touch the latest games (or some from last gen).

In case that wish list link doesnt start working here are the direct links:

COOLER MASTER RC-690 http://www.newegg.com/Product/Prod [...] 6811119137
CORSAIR CMPSU-550VX 550W PSU http://www.newegg.com/Product/Prod [...] 6817139004
ASUS P5Q Pro P45 motherboard http://www.newegg.com/Product/Prod [...] 6813131299
Intel Core 2 Quad Q6600 2.4GHz CPU http://www.newegg.com/Product/Prod [...] 6819115017
Mushkin 4GB (2 x 2GB) DDR2 800 (PC2 6400) RAM http://www.newegg.com/Product/Prod [...] 6820146731
SAPPHIRE 100242L Radeon HD 4850 512MB http://www.newegg.com/Product/Prod [...] 6814102747
Seagate Barracuda 7200.11 320GB 7200 RPM HDD http://www.newegg.com/Product/Prod [...] 6822148316
LITE-ON 20X DVD±R DVD Burner with LightScribe SATA http://www.newegg.com/Product/Prod [...] 6827106073
XIGMATEK HDT-SD964 92mm CPU Cooler http://www.newegg.com/Product/Prod [...] 6835233014

SAMSUNG 2253LW 22" Widescreen LCD Monitor http://www.newegg.com/Product/Prod [...] 6824001271
Microsoft Natural 4000 USB Wired Ergonomics Keyboard http://www.newegg.com/Product/Prod [...] 6823109049
Microsoft Windows Vista Home Premium SP1 64-bit http://www.newegg.com/Product/Prod [...] 6832116488