Yeah, I've swapped parts or been minimally involved in other computer builds, but this is my first, and it was successful!
My old HP m8200n Media Center PC was dying, and I figured I'd spend money starting over rather than spending money to upgrade. So, for less than $500 (much less after I send these rebates in), I have a nice quad core system with nice graphics and good amounts of space all because I spent a few hours not being lazy.
THE PARTS - I've provided links, but prices have mostly gone up since the holiday. They're still pretty good, though, and Newegg's shipping is fast.
Power Supply, OCZ Falat1ty 550W Modular - I guess I could've gone with more power, but I checked my needs against the parts I purchased, and this is more than enough. I'm happy that I got a modular model (one that has removable connections, so you can use only the cords you need) because the cord situation got a little crazy. It's also 80 PLUS certified and is ATX12V compatible, which is good since these features maximize energy efficiency and output.
CPU, AMD Phenom II x 4 955 Black Edition - So far I haven't really done anything labor intensive, but even with rudimentary tasks I can tell the difference from my old Athlon dual-core processor. I could've gone with an Intel, but for the extra money it just wasn't worth it for me.
Motherboard, Asus M4A88TD-V EVO/USB 3 - Nice motherboard for a cheapskate who wants to skip an extra graphics card but have HD capabilities. For my old system, I bought an Nvidia 8600 GT to get dual monitor capabilities, but there's no need with this MOBO. I currently have my flat panel monitor and LCD television hooked up and it's just fine. (There's a VGA, DVI, and HDMI out; the last is awesome since you don't have to have a separate cord for audio if you use it.)
Memory, G. Skill 4 GB DDR 1333 Dual Channel - It was well priced and highly rated. So far, so good. Since I'm finally using 64-bit architecture, I'll probably add additional memory at some point.
Case, Rosewill Destroyer ATX Tower - This was probably my biggest deal. This thing is huge and roomy and has three fans, located so that your system stays cool. I had absolutely no problem building inside this thing. Best of all, it was $39.99 when I bought it. Love it!
I finished it off with an LG DVD player and a Seagate 1 TB hard drive. Unfortunately, the Western Digital Caviar Black I bought arrived dead, so I had to run out to the Tiger Direct to grab one.
So yeah, I'm pleased as punch right now.
