Case:
Antec P180B $114.99
Power Supply:
Seasonic S12 500W $119.99
Motherboard:
Gigabyte P965-DS3 $144.99
CPU:
Intel Core 2 Duo E6400 $220
RAM:
Crucial 2GB DDR2 667 (3-3-3-12) $229.99
Video:
Sapphire Radeon X1900XT 256MB or
EVGA Geforce 7900GTO $259.99 vs $253.99
(I will leave this ambiguous to ward off any flame-wars here. I would take the ATi.)
Audio: On-Board is fine to most people's ears. You decide.
Hard Drive:
Seagate 7200.10 320GB SATA 3.0Gbps $94.99
Optical Drive:
Samsung DVD+-RW Lightscribe Drive $32.99 (If you prefer NEC/Lite-On, go with that. I'm not particularly anal about Optical Drives)
$1211.93-$1217.93 before shipping on Newegg (Depending on GPU)
$100 more gets you an Intel C2D E6600 that you may/may not miss.
Case: Feel free to go for a cheaper/cooler-looking case
Power Supply: A lot of people here recommend Enhance PSUs (available at ewiz.com) which can save you about $30. 500W is plenty of power, don't worry. Unless you plan on dropping in another CPU/GPU in the coming months, don't worry about 500W not being enough.
CPU Heatsink: If you are not OCing, stock is fine.
Keyboard & Mouse: Choose whatever catches your eye.
Rebuttal in Advance: I recommend the Gigabyte even though OP says he doesn't want to OC. Well, it IS a great board with great support. And with the potential power at his fingertips, all he will need is an hour to read a proper article on OCing - he might want to give it a shot some day. Set RAM Divider to 1:1, dial in a 333 FSB and lo, you have an E6700 (minus 2MB L2 cache), with your RAM still at rated spec at 3-3-3-12 timings. And you will probably do it without playing with voltages (except setting RAM to 2.2V).
And people, ^^^ is how you link to products at Newegg!
