Info from an 8890 Owner...I bought my 8890 back in Sept (when the 16" was still available). My quick & generic notes to help in purchase:
Any CPU and mem config is OK, mem over 512 is fine, don't go over 1 Gig as mem speed goes Down from 400 to 333 (at least in the 8890). Plain DVD multi-drive is OK as well, I did not get writer as my desktop one is DVD+RW.
HDD: 60 @ 7200. Must have. You will Not regret this.
LCD: My 16" is 1280x1024, which is smallest I can stand for the size. This is really a 'personal taste' issue, go look at a laptop that runs similar screens to what you're looking for and see if you are willing to live with it.
Wireless & Bluetooth: Don't get unless you think you'll have need for it. Also you cannot have them running at same time, they'll conflict. I made mistake of getting both and not using either, though I was purchasing system with plans on not getting another one for least 4-5 years (Yeah I'm an optomist).
If the system has embedded MP3 player available, don't get it (I only got for the SD card, which is in my DV camera now). Multi-reader can be skipped too, there are better ones around.
My system was a farly maxed one, and 3 years warranty as well, for about $3500. See details of it in the sig, adding bluetooth, wireless, reader, and MP3 player/w 256. Paint scheme was not available from the reseller I used, but was not worried about that.