I'm behind the curve on these new i7 motherboards, but I'm pretty sure the X58 chipset is the only one.
Here a roundup of a few. While all under $300 they are still quite expensive LINK
I'd suggest an MSI board would be the quietest, but their 'budget' X54 Platinum doesn't have SLI, doesn't perform all that well, and is not really all that cheap.
The main thing to look for is 'no northbridge fan required'. These little fans can make a lot of noise, so passive cooling here is your main ticket to silence.
As for CPU coolers, I would recommend a Noctua. They cool very well and are, in my opinion, the quietest CPU air coolers around. Also, if you need case fans, Noctua would be my recommendation.
With PSUs, non-modular is seen as the enthusiast's chioce, but in reality you won't notice any voltage drop with a modular PSU. Mine's non-modular, but that's just because I wanted the best (PC Power & Cooling). Apart from saying PC P&C are the best, I can't really help with quiet PSUs etc. sorry.
If you don't game much, it's hard for me to recommend a grphics card. But considering the resolutions you must be running at, I'd say a GTX 260 216 would be a good 'budget' choice. I know it's not really cheap, but at $210, compared to some of the stuff on the market today it is :)
I know this isn't all that useful, but I thought you deserved a reply. Hopefully someone will correct me, and the tread will take off ;)