Don't ask for help about silence @ Tech Forums, you won't get it.
Get a P182 and either a Scythe Ninja with a low speed yate loon. Get a bunch of low speed yate loons for the case itself. Get a Corsair HX520. Use an Accelero S1 for your video card.
Purchase the yate loons @ petra's tech shop. ALSO.. PLEASE, don't just buy fans based on what manufactuers(spelling.) rate them at. Because that's BS, and a lot of times (for example, in Thermaltake and SilenX's case) they are completely BS.
Yeah, but cases like the RC 690..
Stuff like foam, at least in my experience has proven not to help much or very significantly, and I think you can get quiet enough without it, especially @ your budget.