I've avoided certain kinds of upgrade in the past specifically because getting used to a faster feel is addictive... But 20G is swapfest-level at this point :-) Noise is a much more real problem than people give it credit for; consider one of the power supplies from pcpowercooling.com as a way to fix the noise level, there. (I'm working on replacing several of my older minitower servers with fanless mini-itx systems that will end up being more powerful and about the same cost...)