1st PC build, need a parts check/advice

So building my own PC seemed...scary, risky, and time intensive a week ago. I just wanted a box PC and get on with it...then I started reading posts here and looking around the net for info on computer building. Now I'm feeling an itch to try my hand at putting a system together - but I'm far to uninformed to do this battle correctly.

Here's what I've been going over:

Parentheses denote the price after rebate. No prices include shipping and handling. The item listed first is the one that I'm favoring due to reviews I've read on the products/price/need/etc...

Motherboard:

EVGA 775 NVIDIA nForce 7801 SLI ATX Intel Mobo - $250

Power Supply:

Antec TruePower Quettro 1000 w ATX 12V - 240 vw - $300 (200)

XION Supernova 600 f14R ATX 12v - 600 v - $120 (90)

CPU:

Intel Core 2 Quatro Q9300Yorkfield 2.5GHz 6MB L2 - $270

Intel Core 2 Duo E8400 Wolfdale 3.0 GHz 6MB - $190

CPU Fan:

Zalman CNPS 9700NT 1100mm 2 Ball ultra quiet - $80

Antac 761345-7502410 120 mm Blue - $20 (15)

Memory:

Corsair Dominator 2 GB (2x1GB) 240 Pin DDR2 SDRAM 1066 (PC2 8500) - $100 (84.25)

Corsair Dominator 2048 PC6400 DDR2 800 MHz - $86 (46)

Video Card:

KFA2 by Galaxy GeForce 9800GFX 512MB 256-bit GDDR3 PC2 express 2.0x16HDCP - $220 (180)

Visiontek 900241 Radeon HD 4850 512 MB - $190 (170)

Hard Drive:

Western Digital Cavier SE16 500GB 7200 RPM 16MB Cache SATA 3.0GB - $80

Western Digital Raptor 150 GB 10000RPM 16MB Cache SATA 1.5GB - $175

Media Reader:

5A BRANT CRW-UINB 65-in-1 USB 2.0 - $14

Optical Drive:

Lite-on Black 20xDVD+R, 8xDVD+RDL. 26xDVD, etc... - $29

TV Tuner:

Leadtek WinFast PxPVR1200 PEE Express 1.0A/1.1 Interface tuner card - $47

Sabrent TV tuner/video capture/ MPEG recording - $17

Total Cost without shipping or discounts...about -$1360

A little over the budget that I wanted to target but far and away the best I've seen.

Do all these mix and match correctly? Are any over priced?

Opinions are appreciated as I'm trying to have my first build go as smoothly as possible and of course rookie mistakes won't help at all.

If you had to knock 1 or 2 parts down to a new teir of affordability, which ones listed can most afford to go cheap.

Where are you buying these parts from ?

Are you planning for an SLI or Crossfire setup, or just a single video card ?

I didn't see a case there.

You're keeping your current monitor right ? What resolution will you be gaming at ?