I'm currently building a new PC, and have built all of mine for about 10 years now. I'm more interested in my PC's being quiet rather than ungodly powerful, so my selections favor low power and silence.
Currently I have an older ASUS DDR2 board, AMD AM3+ PhenomII X4 955 CPU, 4GB of RAM, Seasonic 750W PS, 4 Seagate 320GB HD's, Radeon 5750. I've replaced various parts over about 4 years. It's all in a LianLi PC-S80B, custom water cooling using an Eheim pump, Fesser 120mm radiator, Innovatek CPU waterblock, XS 5.25 bay reservoir, Scythe fans, other misc stuff. Had to make a few case mods to get some things to fit inside the case, and it's pretty cramped but very quiet. I played this setup all through the beta and had no trouble at all.
For the new PC, I'm keeping the processor, PS, waterblock, fans, but everything else will be new. ASUS M5A99X MB, 16GB of GSkill RAM, 240GB Intel 520 SSD, waiting on the HD's to come down in price a little then I will get a 2GB or 3GB for storage and 1GB for backup. Thinking a Radeon 7750 for the low power reqs, maybe a 7770. New case is a LianLi PC60, got an EK 120mm rad, Swiftech MCP35X pump and a little 80mm Bitspower res. Doing some case mods to mount the rad and res outside the case this time. Lots of cable sleeving so I can do that this time too, and just take my time to make it super tight and clean.
With the current PC, the only thing I can hear is the graphics fan, but no one makes water blocks for low/mid range GPUs, so I might try to make a custom one.
I’ve received the case and everything but the water cooling parts already. Those should arrive tomorrow or early next week. I'll be taking my time with the case mods on this one though so I don't expect to have it ready to run for a few weeks, but I couldn't resist trying the SSD, MB and RAM so those are sitting in my old case right now and it's very nice! Went from a 5.2 to 7.2 Windows experience rating.
Also upgraded my old Dell 20” LCD to a Dell U2412M IPS, which is beautiful.
In total I’m up to about $1500 right now, and will probably drop another $400 for the video card, HDs and misc parts. I spent about the same amount on the previous PC over time, and for what I can still use and what has lasted for 4 years, I’m comfortable with the cost. I’m expecting this one to last at least just as long.
I don’t play a lot of games, I love Diablo and have been playing since D1. I’m also a developer, and use this PC mostly for contract work which is why I really want it to be quiet, stable and last for a long time.