I bought some cool stuff when i built my desktop...

as fuzzy said, i5-25k has almost no difference than i7 series.
however, as ivy came out, my CPU is kinda... little less advanced than before
http://www.pcworld.com/article/171556/in...ained.html

if you have ivy bridge, you will have increased incorporated CPU-GPU unit, which is known as intel HD graphics.
which, if you don't buy the GPU.
http://www.pcmag.com/article2/0,2817,2405317,00.asp

but. what kind of fuckin idiot would not buy GPU when building Desktop?
i would really suggest top-notch graphic card as GPU is one of main source of top-notch gaming.
good GPU- quality game experience. buy something like 690. (too much? ) oh, i believe intel works better with NVidia and ATI with ATI (they merged the GPU and CPU company together i believe)
http://www.geforce.com/hardware/desktop-...ce-gtx-690

RAM, who gives a crap, it's cheap, pay 50 bucks or so and get 8 GB. [unless you are running a server(small) than 32GB...]
just make sure you either get one 8GB or 2 4GB's.
just don't get 4 2GB's...
Corsair makes good RAM.
oh, make sure it is DDR3. DDR2 sucks.
http://www.corsair.com/en/

I also suggest buying SSD for your storage. just 200GB to store your Windows OS, and some competitive gaming. i.e. League of Legends, Starcraft (it increases your shit better than HDD)
200 GB was not enough for me, so i went ahead and bought myself a 2TB, 8000RPM (around that) HDD for recordings, music, movies, and por... (nvm)

Window 7 is the way to go. Just go buy it, don't pirate it.
some say Vista is better than 7 for games. I don't think so.
http://www.guru3d.com/article/windows-7-...formance/8
as you can see, Windows 7 has the edge when it comes to higher res gaming.

for PSU, just go ahead, buy 500~800W... make sure to buy one of those which have "nature friendly" thing because it will save your electricity... i dont know how many hours you are gonna play,
but i play for 6 hours in weekends... power saving is important...

for cooling, i recommend something that is appropriate. i have liquid cooling.
i burnt my hand while touching CPU without cooler. it hurts.

buy Sound card, for Christ sake. people have lot's of problems with his/her sound without it.
Asus Sonar DX 5.1 will do awesome.
if you are a DJ, a little more expensive.
http://techreport.com/articles.x/14500
50~100 bucks of spending on sound card would enhance your gaming experience WAAAAAY MOOOORE (i know because i had troubles with sound too until i got myself sound card and no problemo)

for Case, unless you are aiming for crossfire/SLI and extra fancy stuff, i.e. SUPER COOLING MEGA LIQUID FAN, SUPER DUPER MEGA 50TB 10HDD, i would recommend Medium tower.
Small tower- too small to fit in your huge ass GPU
Medium tower-perfect
top tower-too big
http://www.ebuyer.com/327904-nzxt-phanto...a-ph410-b1 <-- sexiest case, smoking hot (literally)
make sure to install all the fans for extra cooling!

have a wonderful shopping then.