I agree that the 1.8 is probably the sweet spot in terms of price/performance. If you're going to keep it for a long time, it makes sense to look at the 1.8 over the 1.6.
If you're going to sell it in 2 or so years, the 1.6 is better, because you won't lose as much money (resale value in 2 years won't be much different between the 1.6 and the 1.8). But, if you're thinking along these lines, check out the DP-G4. I would guess it will only cost you about $500 a year to run the G4 and sell it 2 years from now, and quite possibly less.
The DP Macs have the best resale, but there's more money depreciating in the first place. So, if you're on a budget (or are stretching the budget you have), you may find it better to avoid the G5 dream machine.
If you are careful with the configuration and buy from the AppleStore, a DP or 1.8 can be very reasonably priced compared to the 1.6. Hint: drop the SuperDrive and go with the smaller HD, add them in later. Put the base RAM in but no more, and be sure to add bluetooth, as it's on the motherboard and can't be added later. Purchase a bunch of RAM from a 3rd party vendor, and you're good to go.
While you're playing around, have a hard look at the DualG4 base configuration, which is pretty much stripped of all the extras as it sits. For $2250, it's a true bargain. If money is tight, you have to shop in the basement.
Consider any software deals or display options that might be available with a new Mac as well.
There are really 2 things to consider when buying a computer (any platform). One is the initial cost, and the other is what it will cost to run (depreciation). If you're just stepping up to a desktop Mac, you may find it pays to get a bargain machine now and use the better resale value of that to help pay down the one you really want, 2 or 3 years from now.
My own rule of thumb is to never consider upgrading until the new machines are at least twice as fast as what I have; 3x is even better (best bang for the buck).
[ September 24, 2003, 02:01 PM: Message edited by: gordguide ]