This is why I always run at least two PCs and maintain them. That way when I am having downtime due to modding etc I always have a PC to be on. It saves me weeks of messing around. That was partially why I bought Dianoga, so that hours spent just staring into space would be putting hours on the caps and so on in a cheap rig, rather than my expensive one.
It's also better because I can concentrate a lot more on fine details when building or modding a rig without worrying about having it back together at the end of the same day to use it.
Yeah, depending on how the whole case saga goes I'm thinking of ordering a test bench for just that purpose - to be fair I had the old system all set together but the internals were coming out to go in the new one which is when all the problems came to light. Sold all my old stuff recently for about £900 so not a small amount of money and paid for a lot of this in effect... More to sell once this gets sorted.