yeah intel use lga775 for virtually everything nowadays

well coz u have a medium budget i sugest u get one of these :-

1)normal intel board 2 gigs of 1x2 u dont need 4 GB , either a C2D or Q6600 its not expensive as for graphics coz u watch movies and play i sugest u get either a 8600 or 8800 if u wana futurproof ur pc, and for the PSU get something like 500watts is enought and the rest HDD,case,cooling it wont matter that much but if u want something fast get the WD raptor 10,00rpm if u want something normal get a 7200rpm HDD, and for a case get something like a 'asus vento <---- little pricy or get a normal atx case with good ventelation and make shure its rigid and for cooling coz u dont game tht much or OC'' get 2 180mm fans place 1 in the front and 1 in the back for a curculation system.

2)this is gona save u a few bucks but is gona be ok for you :- asus ,msi, abit mobo and get a AMD athlonx2 4000 or 5000 and get 2 gigs of 512x4 value select ram coz its cheaper to get ram in 512x4 then in 2 gb 1x2 and for the hdd a normal samsuang would be good , get yourself a nvidia 7series Gfx and a 350watt PSU would be fine. the first would be better but u wouldnt need tht much power if u just watch movies and ocasonaly play games.

And if u ever do go crazy get this EXTREME !!!!

Processor
Quad Core - Intel Core2 Extreme Quad-Core 3.0GHz QX6850 performance enhanced
Memory
4 GB 1066MHz CORSAIR PC2-8500 DDR2 SDRAM SLI Ready
CPU and Graphic cards liquid cooling
Motherboard
ASUS Striker Extreme 680i
Operating System
Microsoft Windows Vista ULTIMATE
Graphics and Audio

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Graphics Cards
Dual ATI RADEON X2900 XT 1GB, with 1GB of GDDR4 SDRAM (LC)
Physics Acceleration
AGEIA PhysX 100 Series PCI-E Accelerator Card
Audio Boards
Creative Audio Sound Blaster X-Fi XtremeGamer Fatal1ty Professional
Power Supply
1.1KW Power Supply

Storage Systems
Primary OS Storage
RAID (0) Performance - 3 x 160GB 10,000 rpm SATA
Secondary Data Storage
RAID (1) Data Reliability - 2 x 160GB 10000 rpm SATA
Optical Disk Bay 1
Super multi-drive, slim slots with Lightscribe (DVD+/-R/RW+/-DL)
Optical Disk Bay 2
Second Super multi-drive, slim slots with Lightscribe (DVD+/-R/RW+/-DL)
5.25" Bay
Blu-ray Rewriter and HD DVD-ROM Super multi-drive with LightScribe (CD-R/RW, DVD-R/RW/RAM, +R/RW, +/- R DL) (Selecting this option may delay your order)

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Hard Drive Usage
Bay 5 Bay 4 Bay 3 Bay 2 Bay 1
Software

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30-inch wide LCD Monitor
Bose Companion(R) 5 multimedia speaker system
Headsets
Creative Fatal1ty Gaming Headset
Logitech G9 Mouse
Logitech G15 Gaming Keyboard
Logitech Extreme 3D Pro

With specs give it anything and it will be able to break in half and then spit on the floor and i mean, and u like have to keep a frakin lock on the case and like put in a volt coz its gona cost thosands. just fly through things with this BEAST.

500w wont run at high end 8800 very well

550-650 (and a good brand) is better

thats tru but a 88like the GTS with 320mb would be fine unless u have more then 2 HDD's and like many optical drives.

i would say get a decent kick but motherboard that fits around what you need you pc to do once it is built.
Then you can add ram drives etc as you go along

Well, I hope my 2-cents is not too late - I bought an Antec case that has the large 120mm fans that are mounted using silicon rubber rivets. It is incredibly quiet and does a real good job of keeping my machine cool (I keep a history and the shooters I run generally only up the temp by a degree or 2) I am not advocating Antec - I am advocating the 120mm fans and the silicon rubber mounting.