Here's a nice cheap psu. Works very well too.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817153052

Here's mine. I dig the clean look. I use objectdock and have it set at the top of my screen, so when I mouse up there, it pops up.

Here are the texture packs I use...

Terrain Pack

Terrain Pack Rocks Add On

Megaton Re-Done Texture Pack

Rivet City Texture Pack

Here are some other mods I use as well...

Ultimate Perk Pack

Weapon Mod Kits

Repair Rethought

Accurate Assault Rifles

Here's a good list of the recommended mods...

50 Mods You Should Be Playing For Fallout 3

There's also a difference between just pretty graphics and technical graphics. Look at the Resident Evil remake for Gamecube. That game looked amazing because of the still environments and fixed cameras. But technically, no console game will ever touch pc games. They just don't have the power to render huge open worlds with crazy technical things going on, like in Crysis and Stalker.

http://www.youtube.com/watch?v=ykwoD_eH8zs

Make sure you click the high quality.

GPU: HD4850 ($178.69) http://www.newegg.ca/Product/Product.aspx?Item=N82E16814102770

Ram: OCZ Gold 4gb ddr2 800 ($48.15) http://www.newegg.ca/Product/Product.aspx?Item=N82E16820227199

CPU: Q6600 ($245.99) http://www.newegg.ca/Product/Product.aspx?Item=N82E16819115017

Mobo: P5Q ($146.49) http://www.newegg.ca/Product/Product.aspx?Item=N82E16813131295

HD: WD 500gb 7200rpm 32mb cache ($92.49) http://www.newegg.ca/Product/Product.aspx?Item=N82E16822136320

PSU: Corsair 550w ($111.04, before USD $20 MIR) http://www.newegg.ca/Product/Product.aspx?Item=N82E16817139004

DVD: Lite-On 20x dvd ($27.49) http://www.newegg.ca/Product/Product.aspx?Item=N82E16827106263

Case: Antec 300 ($74.19) http://www.newegg.ca/Product/Product.aspx?Item=N82E16811129042

Total: $924.53 without shipping or MIR.

A lot of those items are a lot cheaper on newegg. Here's what I would go with...

GPU: HD4870 ($194.99, $174.99 after MIR) http://www.newegg.com/Product/Product.aspx?Item=N82E16814161236

Ram: G.Skill 4gb ddr2 800 ($49.99) http://www.newegg.com/Product/Product.aspx?Item=N82E16820231148

CPU: Q6600 ($194.99) http://www.newegg.com/Product/Product.aspx?Item=N82E16819115017

Mobo: P5Q ($118.99) http://www.newegg.com/Product/Product.aspx?Item=N82E16813131295

HD: WD 640gb 7200rpm 32mb cache ($79.99) http://www.newegg.com/Product/Product.aspx?Item=N82E16822136319

PSU: Corsair 550w ($89.99, $69.99 after MIR) http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004

DVD: Asus 22x dvd ($27.99) http://www.newegg.com/Product/Product.aspx?Item=N82E16827135186

Case: Cooler Master RC-690 ($79.99) http://www.newegg.com/Product/Product.aspx?Item=N82E16811119137

Total: $836.92 without shipping or MIR.

Tigerdirect seemed to overprice a lot of their items. I tried to keep some of the same components, like the mobo and cpu, and as you can see, they're a lot cheaper on newegg. Also, that psu, dvd drive, and hdd you had were waay overpriced.