The newegg gods aren't posting my links correctly. Checkout the corsair builders series 500w for $49.99 after rebate.
Your system should run within specs since you're not overclocking. Noise is one of my concerns; not just temps. Normal temps for the cpu can go as high as 72C under load. Your video card will be the source of most of the noise, but that's normal. Only limitation of your oem motherboard is that it won't allow for any overclocking, but you can't do much about that since your operating system is tied to a small bios string (changing boards requires a new windows coa).