I am a Computer/Electrical Engineering Student, and my old computer which was a Dell XPS 410, powered by a Core 2 Duo E6600 2.4Ghz was showing its age.
CPU Most of the money went to the CPU. Main uses are running ( and debugging, which was extra slow on the E6600) with Visual Studio and doing simulations with Xilinx Project Navigator, and other CAD purposes, so I wanted a beefy CPU that fit the budget. I got a i5-4690, couldn't be happier. Everything runs really well. Using stock cooler. Since I'm not overclocking, it's just fine and isn't too loud either. Idle temps are around 33C and under load is around 62C.
Motherboard For the motherboard, I just went with the Asus B85M-G R2.0. No real reason, it just met my needs and was affordable.
RAM At the moment, 8GB RAM is sufficient, but if I want to go for 16GB in the future it will be a cheap upgrade. Just went standard Crucial 8GB. Too many options, just picked one.
Storage I got a new 500GB Western Digital Blue HDD, and I don't think I'll ever fill it up really. It's paired with an old 250GB Western Digital drive I salvaged from my brother's old laptop, and that drive stores all my videos/movies, photos, music, et cetera. Now that I think about it, I could've gotten a sub 100GB SSD for my main disk and that'd be totally sufficient, but too late now.
Graphics Card Video card was reused from my old computer. A Galaxy 9500GT 1GB DDR2, from 2008. It's about as powerful as a Geforce 510. It's totally fine, since I don't require a powerful graphics card for this. It's good because it's got DVI and VGA output for my dual monitors and since the only games I play on PC are from before 2010, it's never too weak. But I rarely game on my PC anyway, so it doesn't matter. I'm aware that Intel HD 4600 is stronger, but for some reason DVI wouldn't be recognized and I didn't want to bother troubleshooting.
PSU Power Supply is 550W, a little overkill for my current build, but it can last me to the next build, and if I ever want to throw in a GTX 980 or something and do modern PC gaming, I'm not being held back.
Case Enermax Fulmo-Q. Pretty much just a generic case. I thought it looked kinda cool with the mesh on the front so the blue LEDs on the fan can show through, but it's just a case and does its job. Only complaint is that peripherals don't seem to plug in all the way on the front USB ports, and it is a very tight fit to even get the 3.5" HDD in the drive mount.
Fans Case came with a fan mounted which exhausts air out the back. I bought a Corsair AF120 Blue LED case fan and mounted it in the front and blows air inside the case. And it looks pretty sweet.
Optical Drive DVD drive salvaged from old XPS 410. Nothing special.
OS Running Windows 7 x64 Enterprise.
Cable management is horrific, and part of it is because the cables on the PSU aren't modular and kinda suck, but since the window of the case is covered by my secondary monitor I don't really care or think about it.