For VM's.....16gigs does not matter.
Nonsense. How can I give 4GB to Windows, 8GB to Ubuntu, and 4GB to Lion if I only have 8GB RAM?
If you can run Win7 with 1GB and get anything done, good for you. Since Win7 uses something like 1050MB on a fresh boot, I question how much I could get done on such a setup. SSDs are fast, but they are not DDR3 fast.