Thanks, denverhockeyguy and pseudoswede. Is the 16GB limit (i.e. 2x8GB DIMMs) I see on pretty much every laptop because that's the most that can be supported by the DIMM architecture, or is it simply that no one makes 16GB DIMMs (for 2x16GB = 32GB)?

And I understand that 16GB should be enough for my needs, but I tend to keep my laptops a long time and I'm not sure the same will be true a couple of years from now.

I haven't ruled out a MBP, but it would mean relicensing some software for that platform . . . adding to the cost.

The Dell Precision looks pretty awesome, except for the 16GB limitation. It's still a hair over 4lbs, but the size of the display may make it worthwhile