new P45 based build--advice wanted

This will be my first build in the last 10+ years. (I've been lazy and bought systems, I will be getting back to my roots and building it myself partly to save money, party just because). The purpose of the system is a mix of writing and running engineering simulations, playing games, photo editing (in that order). I plan to run Vista Ultimate 64-bit. I will overclock, but not anything radical.

CPU: Intel Core 2 Quad Q9450 Yorkfield 2.66GHz 12MB L2 Cache LGA 775 95W Quad-Core Processor

mobo: ASUS P5Q Deluxe LGA 775 Intel P45 Intel Motherboard

video: SAPPHIRE 100242L Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card

hard drive: Western Digital Caviar SE16 WD5000AAKS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive

optical drive: ASUS Black 20X DVD+R 8X DVD+RW 8X DVD+R DL 20X DVD-R 6X DVD-RW 14X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 20X DVD±R DVD Burner with LightScribe

CPU cooler: XIGMATEK HDT-S1283 120mm Rifle CPU Cooler with XIGMATEK ACK-I7751 Retention Bracket - Retail

thermal compound: Arctic Silver 5 Thermal Compound

thermal compound remover: Arctic Silver ACN-60ML (2-PC-SET) Thermal material Remover & Surface Purifier

case: COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case

power supply: Thermaltake Toughpower W0128RU 650W ATX12V / EPS12V Power Supply 100 - 240 V

memory: (8 GB total) 2 x CORSAIR DOMINATOR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory

mouse: Logitech G9 Black 5 Buttons Tilt Wheel USB Wired Laser 3200 dpi Gaming Mouse

keyboard: Logitech G15 2-Tone 104 Normal Keys 29 Function Keys USB Wired Standard Gaming Keyboard

monitor: SAMSUNG 2053BW High-gloss Black 20" 5ms (2ms GTG) Widescreen LCD Monitor 300 cd/m2 DC 8000:1(1000:1)

Advice welcome!
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  1. The Q9550 is only $5 more at Newegg. $330
    I'd go with a quality DDR2 800 and overclock it yourself to save a good amount of $
  2. Go with a cheaper power supply, this OCZ 600w GameStream is only $60 after rebate which will save you $90
    If you go with this DDR2 800 Mushkin Ram at $68 after rebate for one (can only get 1 rebate per household) $88 for the other $156 total you'll save another $122. That will pay for a HD4870 and the $5 for the Q9550
  3. Thanks for the advice so far. I will switch to the Q9550.

    As for memories, I was under the impression that it might be problematic to run 4 memory modules together unless I reduce the speed (hence the higher rated memories). Still, it may be worth the risk to go with cheaper memory. Have any of you gotten 4 x 2GB DDR2 800 to run at least at 800?
  4. As for power supplies, how good is the OCZ GameStream supply? (I guess I'll have to read up.) I was going to opt for a modular supply, but I'll consider it.

    I'm not sure about whether I should step up to the HD4870 but I'll think about that too.
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