I can help, since that's like my basic setup.
Agreed on the E2160, great overclocker. There's a great article on Tom's Hardware on this that inspired me to get it.
http://www.tomshardware.com/2007/09/12/pentium_dual_core/
Note that getting a E2180 is better since I hear it's better on the overclock than the E2160 since it has a higher multiplier.
Talking about multipliers, the E2160 comes with 200Mhz bus and a 9x multiplier to give it 1.8Ghz. What you'd like to have, if you want to overclock, is a good quality board (which you mentioned ASUS, which is a good brand and you should be OK with it. I use the gigabyte P35-DS3, which is a good OC board too).
PSU wise I think you should be able to get away with a 400-450W if you're not overclocking. Make sure there is enough amperes on the 12v line for your GPU etc. If you are then maybe go for 500W. There's already some great recommendations in this thread, eg. the CoolMax.
For RAM, it depends on how future oriented you are. I think the DDR3s are too expensive (PS check your motherboards as mine doesn't support DDR3) so DDR2-800 is good to go. I went for the cheaper (at that time) DDR2-667 and since I knew I was going to overclock to 3Ghz (333Mhz x9), the RAM's a god send as I can run it 1:1 timing.
GPU is crucial for 3D gaming, and the resolution of your monitor determines the price range of the GPU you require. So for someone who's not as concerned on big resolutions, a cheaper GPU is OK like the 8600. Go for a 8800GT for high res goodness. Monitors - depends on what you're comfortable with and like. I like mine widescreen and large (22").
If you're OCing like me you may want to consider a cooler like the Zalman (9700). I run my chip on stock cooling which is effective for now but really I should get a cooler to keep the CPU temp low.
PS your case is great.