I was always going to upgrade the flash and I was going to buy 32GB of RAM from SuperBiiz.
Last week, you basically got me thinking about the CPU upgrade which I then convinced myself would be a good investment.
This week, the pricing on the D700s looks very attractive, but I simply don't think I can fully leverage the D300s so I'm standing put for now. The RAM upgrade is in the same ballpark as SuperBiiz so I'll just buy it from Apple.
But they better open up ordering for these things soon, or who knows what I'll end up with!
EDIT: The only things unattractive about the pricing of the nMP are perhaps the base cost, and the 8/12-core CPU's and the latter are Intel's fault more than anything.