The youngest and I upgraded the core i7 machine from 12GB (6×2) to 24GB (6×4) of RAM tonight. Although hard drive prices remain x4 expensive, the RAM is x4 less expensive. The upgrade means I’ll be running a few more 4GB linux instances than I was before [in addition to all of the 512MB special-purposed instances].
Although RAM is x4 less expensive (12GB for $285 versus 24GB for $135), hard drive prices are x3 more expensive. The 1TB Western Digital Black that was $95, is selling right now for $250.